diff options
| author | Rasmus Villemoes <linux@rasmusvillemoes.dk> | 2015-11-06 16:30:23 -0800 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-04-11 10:59:23 +0200 |
| commit | a0f097af14fba5e2b482dab96368b9ceca1b42f8 (patch) | |
| tree | eb26dddeb0f88d22c1f4d92d65b06f8c625ea543 | |
| parent | 8cf44eca24c63cf151be2b1c58f18925ac359907 (diff) | |
lib/vsprintf.c: also improve sanity check in bstr_printf()
Quoting from 2aa2f9e21e4e ("lib/vsprintf.c: improve sanity check in
vsnprintf()"):
On 64 bit, size may very well be huge even if bit 31 happens to be 0.
Somehow it doesn't feel right that one can pass a 5 GiB buffer but not a
3 GiB one. So cap at INT_MAX as was probably the intention all along.
This is also the made-up value passed by sprintf and vsprintf.
I should have seen this copy-pasted instance back then, but let's just
do it now.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Martin Kletzander <mkletzan@redhat.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | lib/vsprintf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c index ab5d28112..cf9555669 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -2061,7 +2061,7 @@ int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) char *str, *end; const char *args = (const char *)bin_buf; - if (WARN_ON_ONCE((int) size < 0)) + if (WARN_ON_ONCE(size > INT_MAX)) return 0; str = buf; |