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printk: fix bounds checking for log_prefix 

Currently log_prefix is testing that the first character of the log level
and facility is less than '0' and greater than '9' (which is always
false).  It should be testing to see if the character less than '0' or
greater than '9' instead.  This patch makes that change.

The code being changed worked because strtoul bombs out (endp isn't
updated) and 0 is returned anyway.

Signed-off-by: William Douglas <william.douglas@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
William Douglas 2011-10-31 17:11:29 -07:00 committed by Linus Torvalds
parent 134620f7a8
commit 48e41899e4
1 changed files with 1 additions and 1 deletions
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2
kernel/printk.c
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@ -595,7 +595,7 @@ static size_t log_prefix(const char *p, unsigned int *level, char *special)
/* multi digit including the level and facility number */
char *endp = NULL;
if (p[1] < '0' && p[1] > '9')
if (p[1] < '0' || p[1] > '9')
return 0;
lev = (simple_strtoul(&p[1], &endp, 10) & 7);