diff options
Diffstat (limited to 'lib/string.c')
| -rw-r--r-- | lib/string.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/lib/string.c b/lib/string.c index 3206d0178296..ce81aaec3839 100644 --- a/lib/string.c +++ b/lib/string.c @@ -313,12 +313,12 @@ EXPORT_SYMBOL(strchrnul); */ char *strrchr(const char *s, int c) { - const char *p = s + strlen(s); - do { - if (*p == (char)c) - return (char *)p; - } while (--p >= s); - return NULL; + const char *last = NULL; + do { + if (*s == (char)c) + last = s; + } while (*s++); + return (char *)last; } EXPORT_SYMBOL(strrchr); #endif @@ -596,6 +596,11 @@ EXPORT_SYMBOL(memset); * @s: Pointer to the start of the area. * @count: The size of the area. * + * Note: usually using memset() is just fine (!), but in cases + * where clearing out _local_ data at the end of a scope is + * necessary, memzero_explicit() should be used instead in + * order to prevent the compiler from optimising away zeroing. + * * memzero_explicit() doesn't need an arch-specific version as * it just invokes the one of memset() implicitly. */ |
