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perf: Fix strncpy() use, always make sure it's NUL terminated

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For NUL terminated string, always make sure that there's '\0' at the end.

In our case we need a return value, so still use strncpy() and
fix up the tail explicitly.

(strlcpy() returns the size, not the pointer)

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Cc: a.p.zijlstra@chello.nl <a.p.zijlstra@chello.nl>
Cc: paulus@samba.org <paulus@samba.org>
Cc: acme@ghostprotocols.net <acme@ghostprotocols.net>
Link: http://lkml.kernel.org/r/51623E0B.7070101@asianux.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Chen Gang 2013-04-08 11:48:27 +08:00 committed by Ingo Molnar
parent dd9c086d9f
commit c97847d2f0
1 changed files with 2 additions and 1 deletions
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3
kernel/events/core.c
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@ -4737,7 +4737,8 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
} else { } else {
if (arch_vma_name(mmap_event->vma)) { if (arch_vma_name(mmap_event->vma)) {
name = strncpy(tmp, arch_vma_name(mmap_event->vma), name = strncpy(tmp, arch_vma_name(mmap_event->vma),
sizeof(tmp)); sizeof(tmp) - 1);
tmp[sizeof(tmp) - 1] = '\0';
goto got_name; goto got_name;
} }