From: Rasmus Villemoes Date: Wed, 21 Oct 2015 22:03:50 +0000 (+1100) Subject: lib/vsprintf.c: also improve sanity check in bstr_printf() X-Git-Tag: KARO-TX6UL-2015-11-03~14^2~61 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d906a3e6df33afea349579efde77f077922fef67;p=karo-tx-linux.git 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 Reviewed-by: Andy Shevchenko Acked-by: Kees Cook Cc: Martin Kletzander Cc: Rasmus Villemoes Signed-off-by: Andrew Morton --- diff --git a/lib/vsprintf.c b/lib/vsprintf.c index e35724c2b2a8..a513469e9399 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -2270,7 +2270,7 @@ 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;