I was reviewing code which I suspected might allocate a zero size SG
table. That will cause memory corruption. Also we can't return before
doing the memset or we could end up using uninitialized memory in the
cleanup path.
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index a1cf8ca..d39178b 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -247,13 +247,15 @@ int __sg_alloc_table(struct sg_table *table, unsigned int
nents,
struct scatterlist *sg, *prv;
unsigned int left;
+ memset(table, 0, sizeof(*table));
+
+ if (nents == 0)
+ return -EINVAL;
#ifndef ARCH_HAS_SG_CHAIN
if (WARN_ON_ONCE(nents > max_ents))
return -EINVAL;
#endif
- memset(table, 0, sizeof(*table));
-
left = nents;
prv = NULL;
do {
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
