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Groups > linux.kernel > #1610725
| From | Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 4.9 85/88] nl80211: fix dumpit error path RTNL deadlocks |
| Date | 2017-03-28 14:50 +0200 |
| Message-ID | <tpYJu-7Cs-61@gated-at.bofh.it> (permalink) |
| References | <tpYJs-7Cs-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johannes Berg <johannes.berg@intel.com>
commit ea90e0dc8cecba6359b481e24d9c37160f6f524f upstream.
Sowmini pointed out Dmitry's RTNL deadlock report to me, and it turns out
to be perfectly accurate - there are various error paths that miss unlock
of the RTNL.
To fix those, change the locking a bit to not be conditional in all those
nl80211_prepare_*_dump() functions, but make those require the RTNL to
start with, and fix the buggy error paths. This also let me use sparse
(by appropriately overriding the rtnl_lock/rtnl_unlock functions) to
validate the changes.
Reported-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/wireless/nl80211.c | 133 ++++++++++++++++++++++---------------------------
1 file changed, 60 insertions(+), 73 deletions(-)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -548,21 +548,17 @@ static int nl80211_prepare_wdev_dump(str
{
int err;
- rtnl_lock();
-
if (!cb->args[0]) {
err = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
nl80211_fam.attrbuf, nl80211_fam.maxattr,
nl80211_policy);
if (err)
- goto out_unlock;
+ return err;
*wdev = __cfg80211_wdev_from_attrs(sock_net(skb->sk),
nl80211_fam.attrbuf);
- if (IS_ERR(*wdev)) {
- err = PTR_ERR(*wdev);
- goto out_unlock;
- }
+ if (IS_ERR(*wdev))
+ return PTR_ERR(*wdev);
*rdev = wiphy_to_rdev((*wdev)->wiphy);
/* 0 is the first index - add 1 to parse only once */
cb->args[0] = (*rdev)->wiphy_idx + 1;
@@ -572,10 +568,8 @@ static int nl80211_prepare_wdev_dump(str
struct wiphy *wiphy = wiphy_idx_to_wiphy(cb->args[0] - 1);
struct wireless_dev *tmp;
- if (!wiphy) {
- err = -ENODEV;
- goto out_unlock;
- }
+ if (!wiphy)
+ return -ENODEV;
*rdev = wiphy_to_rdev(wiphy);
*wdev = NULL;
@@ -586,21 +580,11 @@ static int nl80211_prepare_wdev_dump(str
}
}
- if (!*wdev) {
- err = -ENODEV;
- goto out_unlock;
- }
+ if (!*wdev)
+ return -ENODEV;
}
return 0;
- out_unlock:
- rtnl_unlock();
- return err;
-}
-
-static void nl80211_finish_wdev_dump(struct cfg80211_registered_device *rdev)
-{
- rtnl_unlock();
}
/* IE validation */
@@ -2584,17 +2568,17 @@ static int nl80211_dump_interface(struct
int filter_wiphy = -1;
struct cfg80211_registered_device *rdev;
struct wireless_dev *wdev;
+ int ret;
rtnl_lock();
if (!cb->args[2]) {
struct nl80211_dump_wiphy_state state = {
.filter_wiphy = -1,
};
- int ret;
ret = nl80211_dump_wiphy_parse(skb, cb, &state);
if (ret)
- return ret;
+ goto out_unlock;
filter_wiphy = state.filter_wiphy;
@@ -2639,12 +2623,14 @@ static int nl80211_dump_interface(struct
wp_idx++;
}
out:
- rtnl_unlock();
-
cb->args[0] = wp_idx;
cb->args[1] = if_idx;
- return skb->len;
+ ret = skb->len;
+ out_unlock:
+ rtnl_unlock();
+
+ return ret;
}
static int nl80211_get_interface(struct sk_buff *skb, struct genl_info *info)
@@ -4371,9 +4357,10 @@ static int nl80211_dump_station(struct s
int sta_idx = cb->args[2];
int err;
+ rtnl_lock();
err = nl80211_prepare_wdev_dump(skb, cb, &rdev, &wdev);
if (err)
- return err;
+ goto out_err;
if (!wdev->netdev) {
err = -EINVAL;
@@ -4408,7 +4395,7 @@ static int nl80211_dump_station(struct s
cb->args[2] = sta_idx;
err = skb->len;
out_err:
- nl80211_finish_wdev_dump(rdev);
+ rtnl_unlock();
return err;
}
@@ -5179,9 +5166,10 @@ static int nl80211_dump_mpath(struct sk_
int path_idx = cb->args[2];
int err;
+ rtnl_lock();
err = nl80211_prepare_wdev_dump(skb, cb, &rdev, &wdev);
if (err)
- return err;
+ goto out_err;
if (!rdev->ops->dump_mpath) {
err = -EOPNOTSUPP;
@@ -5214,7 +5202,7 @@ static int nl80211_dump_mpath(struct sk_
cb->args[2] = path_idx;
err = skb->len;
out_err:
- nl80211_finish_wdev_dump(rdev);
+ rtnl_unlock();
return err;
}
@@ -5374,9 +5362,10 @@ static int nl80211_dump_mpp(struct sk_bu
int path_idx = cb->args[2];
int err;
+ rtnl_lock();
err = nl80211_prepare_wdev_dump(skb, cb, &rdev, &wdev);
if (err)
- return err;
+ goto out_err;
if (!rdev->ops->dump_mpp) {
err = -EOPNOTSUPP;
@@ -5409,7 +5398,7 @@ static int nl80211_dump_mpp(struct sk_bu
cb->args[2] = path_idx;
err = skb->len;
out_err:
- nl80211_finish_wdev_dump(rdev);
+ rtnl_unlock();
return err;
}
@@ -7556,9 +7545,12 @@ static int nl80211_dump_scan(struct sk_b
int start = cb->args[2], idx = 0;
int err;
+ rtnl_lock();
err = nl80211_prepare_wdev_dump(skb, cb, &rdev, &wdev);
- if (err)
+ if (err) {
+ rtnl_unlock();
return err;
+ }
wdev_lock(wdev);
spin_lock_bh(&rdev->bss_lock);
@@ -7581,7 +7573,7 @@ static int nl80211_dump_scan(struct sk_b
wdev_unlock(wdev);
cb->args[2] = idx;
- nl80211_finish_wdev_dump(rdev);
+ rtnl_unlock();
return skb->len;
}
@@ -7665,9 +7657,10 @@ static int nl80211_dump_survey(struct sk
int res;
bool radio_stats;
+ rtnl_lock();
res = nl80211_prepare_wdev_dump(skb, cb, &rdev, &wdev);
if (res)
- return res;
+ goto out_err;
/* prepare_wdev_dump parsed the attributes */
radio_stats = nl80211_fam.attrbuf[NL80211_ATTR_SURVEY_RADIO_STATS];
@@ -7708,7 +7701,7 @@ static int nl80211_dump_survey(struct sk
cb->args[2] = survey_idx;
res = skb->len;
out_err:
- nl80211_finish_wdev_dump(rdev);
+ rtnl_unlock();
return res;
}
@@ -11299,17 +11292,13 @@ static int nl80211_prepare_vendor_dump(s
void *data = NULL;
unsigned int data_len = 0;
- rtnl_lock();
-
if (cb->args[0]) {
/* subtract the 1 again here */
struct wiphy *wiphy = wiphy_idx_to_wiphy(cb->args[0] - 1);
struct wireless_dev *tmp;
- if (!wiphy) {
- err = -ENODEV;
- goto out_unlock;
- }
+ if (!wiphy)
+ return -ENODEV;
*rdev = wiphy_to_rdev(wiphy);
*wdev = NULL;
@@ -11330,13 +11319,11 @@ static int nl80211_prepare_vendor_dump(s
nl80211_fam.attrbuf, nl80211_fam.maxattr,
nl80211_policy);
if (err)
- goto out_unlock;
+ return err;
if (!nl80211_fam.attrbuf[NL80211_ATTR_VENDOR_ID] ||
- !nl80211_fam.attrbuf[NL80211_ATTR_VENDOR_SUBCMD]) {
- err = -EINVAL;
- goto out_unlock;
- }
+ !nl80211_fam.attrbuf[NL80211_ATTR_VENDOR_SUBCMD])
+ return -EINVAL;
*wdev = __cfg80211_wdev_from_attrs(sock_net(skb->sk),
nl80211_fam.attrbuf);
@@ -11345,10 +11332,8 @@ static int nl80211_prepare_vendor_dump(s
*rdev = __cfg80211_rdev_from_attrs(sock_net(skb->sk),
nl80211_fam.attrbuf);
- if (IS_ERR(*rdev)) {
- err = PTR_ERR(*rdev);
- goto out_unlock;
- }
+ if (IS_ERR(*rdev))
+ return PTR_ERR(*rdev);
vid = nla_get_u32(nl80211_fam.attrbuf[NL80211_ATTR_VENDOR_ID]);
subcmd = nla_get_u32(nl80211_fam.attrbuf[NL80211_ATTR_VENDOR_SUBCMD]);
@@ -11361,19 +11346,15 @@ static int nl80211_prepare_vendor_dump(s
if (vcmd->info.vendor_id != vid || vcmd->info.subcmd != subcmd)
continue;
- if (!vcmd->dumpit) {
- err = -EOPNOTSUPP;
- goto out_unlock;
- }
+ if (!vcmd->dumpit)
+ return -EOPNOTSUPP;
vcmd_idx = i;
break;
}
- if (vcmd_idx < 0) {
- err = -EOPNOTSUPP;
- goto out_unlock;
- }
+ if (vcmd_idx < 0)
+ return -EOPNOTSUPP;
if (nl80211_fam.attrbuf[NL80211_ATTR_VENDOR_DATA]) {
data = nla_data(nl80211_fam.attrbuf[NL80211_ATTR_VENDOR_DATA]);
@@ -11390,9 +11371,6 @@ static int nl80211_prepare_vendor_dump(s
/* keep rtnl locked in successful case */
return 0;
- out_unlock:
- rtnl_unlock();
- return err;
}
static int nl80211_vendor_cmd_dump(struct sk_buff *skb,
@@ -11407,9 +11385,10 @@ static int nl80211_vendor_cmd_dump(struc
int err;
struct nlattr *vendor_data;
+ rtnl_lock();
err = nl80211_prepare_vendor_dump(skb, cb, &rdev, &wdev);
if (err)
- return err;
+ goto out;
vcmd_idx = cb->args[2];
data = (void *)cb->args[3];
@@ -11418,18 +11397,26 @@ static int nl80211_vendor_cmd_dump(struc
if (vcmd->flags & (WIPHY_VENDOR_CMD_NEED_WDEV |
WIPHY_VENDOR_CMD_NEED_NETDEV)) {
- if (!wdev)
- return -EINVAL;
+ if (!wdev) {
+ err = -EINVAL;
+ goto out;
+ }
if (vcmd->flags & WIPHY_VENDOR_CMD_NEED_NETDEV &&
- !wdev->netdev)
- return -EINVAL;
+ !wdev->netdev) {
+ err = -EINVAL;
+ goto out;
+ }
if (vcmd->flags & WIPHY_VENDOR_CMD_NEED_RUNNING) {
if (wdev->netdev &&
- !netif_running(wdev->netdev))
- return -ENETDOWN;
- if (!wdev->netdev && !wdev->p2p_started)
- return -ENETDOWN;
+ !netif_running(wdev->netdev)) {
+ err = -ENETDOWN;
+ goto out;
+ }
+ if (!wdev->netdev && !wdev->p2p_started) {
+ err = -ENETDOWN;
+ goto out;
+ }
}
}
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[PATCH 4.9 17/88] socket, bpf: fix sk_filter use after free in sk_clone_lock Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 14:50 +0200
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[PATCH 4.9 85/88] nl80211: fix dumpit error path RTNL deadlocks Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 14:50 +0200
[PATCH 4.9 10/88] net/mlx5e: Use the proper UAPI values when offloading TC vlan actions Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 14:50 +0200
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[PATCH 4.9 53/88] parport: fix attempt to write duplicate procfiles Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 14:50 +0200
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[PATCH 4.9 88/88] crypto: algif_hash - avoid zero-sized array Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 14:50 +0200
[PATCH 4.9 55/88] ext4: lock the xattr block before checksuming it Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 14:50 +0200
[PATCH 4.9 61/88] hwrng: amd - Revert managed API changes Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 14:50 +0200
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[PATCH 4.9 62/88] hwrng: geode - Revert managed API changes Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:00 +0200
[PATCH 4.9 87/88] fbcon: Fix vc attr at deinit Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:00 +0200
[PATCH 4.9 66/88] crypto: ccp - Assign DMA commands to the channels CCP Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:00 +0200
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[PATCH 4.9 46/88] uwb: i1480-dfu: fix NULL-deref at probe Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:00 +0200
[PATCH 4.9 80/88] Drivers: hv: vmbus: Dont leak channel ids Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:00 +0200
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[PATCH 4.9 71/88] arm64: kaslr: Fix up the kernel image alignment Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:10 +0200
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[PATCH 4.9 76/88] drm/amdgpu: reinstate oland workaround for sclk Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:10 +0200
[PATCH 4.9 09/88] net/mlx5: Add missing entries for set/query rate limit commands Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:10 +0200
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[PATCH 4.9 65/88] mwifiex: pcie: dont leak DMA buffers when removing Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:10 +0200
[PATCH 4.9 68/88] iommu/vt-d: Fix NULL pointer dereference in device_to_iommu Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:10 +0200
[PATCH 4.9 37/88] usb-core: Add LINEAR_FRAME_INTR_BINTERVAL USB quirk Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:10 +0200
[PATCH 4.9 70/88] ARM: at91: pm: cpu_idle: switch DDR to power-down mode Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:10 +0200
[PATCH 4.9 49/88] iio: adc: ti_am335x_adc: fix fifo overrun recovery Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:10 +0200
[PATCH 4.9 75/88] libceph: force GFP_NOIO for socket allocations Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:10 +0200
Re: [PATCH 4.9 75/88] libceph: force GFP_NOIO for socket allocations Michal Hocko <mhocko@kernel.org> - 2017-03-29 10:20 +0200
[PATCH 4.9 14/88] ipv6: make sure to initialize sockc.tsflags before first use Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 16/88] ipv4: provide stronger user input validation in nl_fib_input() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 02/88] net: bcmgenet: Do not suspend PHY if Wake-on-LAN is enabled Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 25/88] Input: hanwang - validate number of endpoints before using them Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 15/88] net: bcmgenet: remove bcmgenet_internal_phy_setup() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 04/88] amd-xgbe: Fix jumbo MTU processing on newer hardware Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 36/88] usb: gadget: f_uvc: Fix SuperSpeed companion descriptors wBytesPerInterval Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 29/88] Input: sur40 - validate number of endpoints before using them Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 03/88] net: properly release sk_frag.page Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 26/88] Input: yealink - validate number of endpoints before using them Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 12/88] net/mlx5e: Count GSO packets correctly Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 13/88] net/mlx5e: Count LRO packets correctly Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 33/88] USB: serial: option: add Quectel UC15, UC20, EC21, and EC25 modems Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 20/88] Input: ALPS - fix trackstick button handling on V8 devices Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 18/88] tcp: initialize icsk_ack.lrcvtime at session start time Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 19/88] Input: ALPS - fix V8+ protocol handling (73 03 28) Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
[PATCH 4.9 11/88] net/mlx5: Increase number of max QPs in default profile Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-28 15:20 +0200
Re: [PATCH 4.9 00/88] 4.9.19-stable review Shuah Khan <shuahkh@osg.samsung.com> - 2017-03-28 21:50 +0200
Re: [PATCH 4.9 00/88] 4.9.19-stable review Guenter Roeck <linux@roeck-us.net> - 2017-03-29 06:50 +0200
Re: [PATCH 4.9 00/88] 4.9.19-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-29 07:50 +0200
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