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author | Paul Mundt <lethal@linux-sh.org> | 2009-09-22 23:44:12 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-23 14:39:30 (GMT) |
commit | a9ece53c4089ef23d4002d34c4c7148d94622a40 (patch) | |
tree | 9f151e686244f82d38d3364b7e2e3976a1edb087 /scripts | |
parent | 1f10206cf8e945220f7220a809d8bfc15c21f9a5 (diff) | |
download | linux-a9ece53c4089ef23d4002d34c4c7148d94622a40.tar.xz |
kallsyms: fix segfault in prefix_underscores_count()
Commit b478b782e110fdb4135caa3062b6d687e989d994 "kallsyms, tracing: output
more proper symbol name" introduces a "bugfix" that introduces a segfault
in kallsyms in my configurations.
The cause is the introduction of prefix_underscores_count() which attempts
to count underscores, even in symbols that do not have them. As a result,
it just uselessly runs past the end of the buffer until it crashes:
CC init/version.o
LD init/built-in.o
LD .tmp_vmlinux1
KSYM .tmp_kallsyms1.S
/bin/sh: line 1: 16934 Done sh-linux-gnu-nm -n .tmp_vmlinux1
16935 Segmentation fault | scripts/kallsyms > .tmp_kallsyms1.S
make: *** [.tmp_kallsyms1.S] Error 139
This simplifies the logic and just does a straightforward count.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Paulo Marques <pmarques@grupopie.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: <stable@kernel.org> [2.6.30.x, 2.6.31.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts')
-rw-r--r-- | scripts/kallsyms.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c index 64343cc..86c3896 100644 --- a/scripts/kallsyms.c +++ b/scripts/kallsyms.c @@ -585,7 +585,7 @@ static int prefix_underscores_count(const char *str) { const char *tail = str; - while (*tail != '_') + while (*tail == '_') tail++; return tail - str; |