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Groups > linux.kernel > #1284969 > unrolled thread

[PATCH v3 0/3] perf hists browser: Avoid crash in some unusal operations

Started byWang Nan <wangnan0@huawei.com>
First post2015-12-07 03:40 +0100
Last post2015-12-08 06:20 +0100
Articles 3 — 2 participants

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  [PATCH v3 0/3] perf hists browser: Avoid crash in some unusal operations Wang Nan <wangnan0@huawei.com> - 2015-12-07 03:40 +0100
    [PATCH v3 2/3] perf hists browser: Add NULL pointer check to prevent crash Wang Nan <wangnan0@huawei.com> - 2015-12-07 03:40 +0100
      [tip:perf/core] perf hists browser:   Add NULL pointer check to prevent crash tip-bot for Wang Nan <tipbot@zytor.com> - 2015-12-08 06:20 +0100

#1284969 — [PATCH v3 0/3] perf hists browser: Avoid crash in some unusal operations

FromWang Nan <wangnan0@huawei.com>
Date2015-12-07 03:40 +0100
Subject[PATCH v3 0/3] perf hists browser: Avoid crash in some unusal operations
Message-ID<qCTSx-6PC-3@gated-at.bofh.it>
When using symbol filter in hists browser, some unusal operations
causes segfault. This patchset avoid those crashes.

Compare with v2: Improve coding style, check he_selection in 1/3.

Arnaldo: I can't find them in your repository. If you have already
picked these patches, please ignore this version.

Thank you.

Wang Nan (3):
  perf hists browser: Fix segfault if use symbol filter in cmdline
  perf hists browser: Add NULL pointer check to prevent crash
  perf hists browser: Reset selection when refresh

 tools/perf/ui/browsers/hists.c | 8 ++++++++
 1 file changed, 8 insertions(+)

-- 
1.8.3.4

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#1284971 — [PATCH v3 2/3] perf hists browser: Add NULL pointer check to prevent crash

FromWang Nan <wangnan0@huawei.com>
Date2015-12-07 03:40 +0100
Subject[PATCH v3 2/3] perf hists browser: Add NULL pointer check to prevent crash
Message-ID<qCTSx-6PC-7@gated-at.bofh.it>
In reply to#1284969
Before this patch we can trigger a segfault by following steps:

 Step 0: Use 'perf record' to generate a perf.data without callchain

 Step 1: perf report

 Step 2: Use UP/DOWN to select an entry, don't press 'ENTER'

 Step 3: Use '/' to filter symbols, use a filter which returns
         empty result

 Step 4: Press 'ENTER' (notice here that the old selection is still
		        there. This is another problem)

 Step 5: Press 'ENTER' to annotate that symbol

 Step 6: Press 'LEFT' to go out.

 Result: segfault:

 perf: Segmentation fault
 -------- backtrace --------
 /home/wangnan/perf[0x53e568]
 /lib64/libc.so.6(+0x3545f)[0x7fba75d3245f]
 /home/wangnan/perf[0x537516]
 /home/wangnan/perf[0x533fef]
 /home/wangnan/perf[0x53b347]
 /home/wangnan/perf(perf_evlist__tui_browse_hists+0x96)[0x53d206]
 /home/wangnan/perf(cmd_report+0x1b9f)[0x442c7f]
 /home/wangnan/perf[0x47efa2]
 /home/wangnan/perf(main+0x5f5)[0x432fa5]
 /lib64/libc.so.6(__libc_start_main+0xf4)[0x7fba75d1ebd4]
 /home/wangnan/perf[0x4330d4]

This is because in this case 'nd' could be NULL in
ui_browser__hists_seek(), but that function never check it.

This patch adds checker for potential NULL pointer in that function.
After this patch the above steps won't segfault again.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/ui/browsers/hists.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index 75ed14b..9b8a48d 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -1297,6 +1297,9 @@ static void ui_browser__hists_seek(struct ui_browser *browser,
 	 * and stop when we printed enough lines to fill the screen.
 	 */
 do_offset:
+	if (!nd)
+		return;
+
 	if (offset > 0) {
 		do {
 			h = rb_entry(nd, struct hist_entry, rb_node);
-- 
1.8.3.4

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#1286240 — [tip:perf/core] perf hists browser: Add NULL pointer check to prevent crash

Fromtip-bot for Wang Nan <tipbot@zytor.com>
Date2015-12-08 06:20 +0100
Subject[tip:perf/core] perf hists browser: Add NULL pointer check to prevent crash
Message-ID<qDiQW-6q2-9@gated-at.bofh.it>
In reply to#1284971
Commit-ID:  837eeb7569bf2b3bd3b1b82e0e61edb19811036e
Gitweb:     http://git.kernel.org/tip/837eeb7569bf2b3bd3b1b82e0e61edb19811036e
Author:     Wang Nan <wangnan0@huawei.com>
AuthorDate: Mon, 7 Dec 2015 02:35:45 +0000
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 7 Dec 2015 12:02:11 -0300

perf hists browser: Add NULL pointer check to prevent crash

Before this patch we can trigger a segfault by following steps:

 Step 0: Use 'perf record' to generate a perf.data without callchain

 Step 1: perf report

 Step 2: Use UP/DOWN to select an entry, don't press 'ENTER'

 Step 3: Use '/' to filter symbols, use a filter which returns
         empty result

 Step 4: Press 'ENTER' (notice here that the old selection is still
		        there. This is another problem)

 Step 5: Press 'ENTER' to annotate that symbol

 Step 6: Press 'LEFT' to go out.

 Result: segfault:

 perf: Segmentation fault
 -------- backtrace --------
 /home/wangnan/perf[0x53e568]
 /lib64/libc.so.6(+0x3545f)[0x7fba75d3245f]
 /home/wangnan/perf[0x537516]
 /home/wangnan/perf[0x533fef]
 /home/wangnan/perf[0x53b347]
 /home/wangnan/perf(perf_evlist__tui_browse_hists+0x96)[0x53d206]
 /home/wangnan/perf(cmd_report+0x1b9f)[0x442c7f]
 /home/wangnan/perf[0x47efa2]
 /home/wangnan/perf(main+0x5f5)[0x432fa5]
 /lib64/libc.so.6(__libc_start_main+0xf4)[0x7fba75d1ebd4]
 /home/wangnan/perf[0x4330d4]

This is because in this case 'nd' could be NULL in
ui_browser__hists_seek(), but that function never checks it.

This patch adds checker for potential NULL pointer in that function.
After this patch the above steps won't segfault.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1449455746-41952-3-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/ui/browsers/hists.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index fa9eb92..932e13d 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -1033,6 +1033,9 @@ static void ui_browser__hists_seek(struct ui_browser *browser,
 	 * and stop when we printed enough lines to fill the screen.
 	 */
 do_offset:
+	if (!nd)
+		return;
+
 	if (offset > 0) {
 		do {
 			h = rb_entry(nd, struct hist_entry, rb_node);
--
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the body of a message to majordomo@vger.kernel.org
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