[alsa-devel] [PATCH 8/9] sound/isa/gus: Correct code taking the size of a pointer

Julia Lawall julia at diku.dk
Sun Dec 13 12:42:56 CET 2009

From: Julia Lawall <julia at diku.dk>

sizeof(share_id) is just the size of the pointer.  On the other hand,
block->share_id is an array, so its size seems more appropriate.

A simplified version of the semantic patch that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
expression *x;
expression f;
type T;

// </smpl>

Signed-off-by: Julia Lawall <julia at diku.dk>

 sound/isa/gus/gus_mem.c             |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/sound/isa/gus/gus_mem.c b/sound/isa/gus/gus_mem.c
index 661205c..af888a0 100644
--- a/sound/isa/gus/gus_mem.c
+++ b/sound/isa/gus/gus_mem.c
@@ -127,7 +127,8 @@ static struct snd_gf1_mem_block *snd_gf1_mem_share(struct snd_gf1_mem * alloc,
 	    !share_id[2] && !share_id[3])
 		return NULL;
 	for (block = alloc->first; block; block = block->next)
-		if (!memcmp(share_id, block->share_id, sizeof(share_id)))
+		if (!memcmp(share_id, block->share_id,
+				sizeof(block->share_id)))
 			return block;
 	return NULL;

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