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[PATCH 4.10 001/129] 9p: fix a potential acl leak

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4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Cong Wang <xiyou.wangcong@gmail.com>

commit b5c66bab72a6a65edb15beb60b90d3cb84c5763b upstream.

posix_acl_update_mode() could possibly clear 'acl', if so we leak the
memory pointed by 'acl'.  Save this pointer before calling
posix_acl_update_mode() and release the memory if 'acl' really gets
cleared.

Link: http://lkml.kernel.org/r/1486678332-2430-1-git-send-email-xiyou.wangcong@gmail.com
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reported-by: Mark Salyzyn <salyzyn@android.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Greg Kurz <groug@kaod.org>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ron Minnich <rminnich@sandia.gov>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/9p/acl.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/9p/acl.c
+++ b/fs/9p/acl.c
@@ -277,6 +277,7 @@ static int v9fs_xattr_set_acl(const stru
 	case ACL_TYPE_ACCESS:
 		if (acl) {
 			struct iattr iattr;
+			struct posix_acl *old_acl = acl;
 
 			retval = posix_acl_update_mode(inode, &iattr.ia_mode, &acl);
 			if (retval)
@@ -287,6 +288,7 @@ static int v9fs_xattr_set_acl(const stru
 				 * by the mode bits. So don't
 				 * update ACL.
 				 */
+				posix_acl_release(old_acl);
 				value = NULL;
 				size = 0;
 			}

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[PATCH 4.10 000/129] 4.10.16-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 18:00 +0200
  [PATCH 4.10 051/129] iwlwifi: mvm: fix reorder timer re-arming Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 18:00 +0200
  [PATCH 4.10 028/129] arm64: remove wrong CONFIG_PROC_SYSCTL ifdef Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 18:00 +0200
  [PATCH 4.10 041/129] mwifiex: Avoid skipping WEP key deletion for AP Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 18:00 +0200
  [PATCH 4.10 050/129] iwlwifi: pcie: fix the set of DMA memory mask Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 18:00 +0200
  [PATCH 4.10 039/129] mwifiex: debugfs: Fix (sometimes) off-by-1 SSID print Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 18:00 +0200
  [PATCH 4.10 057/129] iwlwifi: mvm: writing zero bytes to debugfs causes a crash Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 18:00 +0200
  [PATCH 4.10 014/129] powerpc/mm: Fixup wrong LPCR_VRMASD value Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 18:00 +0200
  [PATCH 4.10 030/129] spi: armada-3700: Remove spi_master_put in a3700_spi_remove() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 18:00 +0200
  [PATCH 4.10 020/129] power: supply: bq24190_charger: Fix irq trigger to IRQF_TRIGGER_FALLING Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 18:00 +0200
  [PATCH 4.10 048/129] iwlwifi: pcie: dont increment / decrement a bool Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 18:00 +0200
  [PATCH 4.10 021/129] power: supply: bq24190_charger: Call set_mode_host() on pm_resume() Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 18:00 +0200
  [PATCH 4.10 017/129] powerpc/ftrace: Fix confusing help text for DISABLE_MPROFILE_KERNEL Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 18:00 +0200
  Re: [PATCH 4.10 000/129] 4.10.16-stable review Shuah Khan <shuahkh@osg.samsung.com> - 2017-05-11 18:10 +0200
    Re: [PATCH 4.10 000/129] 4.10.16-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 19:50 +0200
      Re: [PATCH 4.10 000/129] 4.10.16-stable review Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 20:20 +0200
  [PATCH 4.10 001/129] 9p: fix a potential acl leak Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-11 18:10 +0200
  Re: [PATCH 4.10 000/129] 4.10.16-stable review Shuah Khan <shuahkh@osg.samsung.com> - 2017-05-12 17:30 +0200
  Re: [PATCH 4.10 000/129] 4.10.16-stable review Guenter Roeck <linux@roeck-us.net> - 2017-05-12 22:00 +0200

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