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authorDeepak Saxena <dsaxena@net.rmk.(none)>2005-04-25 23:40:05 +0100
committerRussell King <rmk@dyn-67.arm.linux.org.uk>2005-04-25 23:40:05 +0100
commit2fac6f3fec2303649e9cd572255776cb93d3f888 (patch)
tree091344bb955417f32aa60f9693612fc06d1079a4 /include
parent41130d37a449dbff3593c8585a102d5e9173eea7 (diff)
[PATCH] ARM: 2653/1: Fix memset and memzero macro double-reference of parameters
Patch from Deepak Saxena The current memset() and memzero() macros on ARM reference the incoming parameters more than once and this can cause uninted side-effects. The issue was found while debugging SCTP protocol and with the specific usage of memzero(skb_put(skb,size),size). This call would call skb_put(skb,size) twice leading to badness. The fixed version copies the incoming parameters into local variables and uses those instead. Signed-off-by: Deepak Saxena Signed-off-by: Russell King
Diffstat (limited to 'include')
-rw-r--r--include/asm-arm/string.h17
1 files changed, 12 insertions, 5 deletions
diff --git a/include/asm-arm/string.h b/include/asm-arm/string.h
index 2a8ab162412f..e50c4a39b699 100644
--- a/include/asm-arm/string.h
+++ b/include/asm-arm/string.h
@@ -29,15 +29,22 @@ extern void __memzero(void *ptr, __kernel_size_t n);
#define memset(p,v,n) \
({ \
- if ((n) != 0) { \
+ void *__p = (p); size_t __n = n; \
+ if ((__n) != 0) { \
if (__builtin_constant_p((v)) && (v) == 0) \
- __memzero((p),(n)); \
+ __memzero((__p),(__n)); \
else \
- memset((p),(v),(n)); \
+ memset((__p),(v),(__n)); \
} \
- (p); \
+ (__p); \
})
-#define memzero(p,n) ({ if ((n) != 0) __memzero((p),(n)); (p); })
+#define memzero(p,n) \
+ ({ \
+ void *__p = (p); size_t __n = n; \
+ if ((__n) != 0) \
+ __memzero((__p),(__n)); \
+ (__p); \
+ })
#endif