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lib/scatterlist: error handling in __sg_alloc_table()

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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.carpenter@oracle.com>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dan Carpenter 2013-07-08 16:01:58 -07:00 • committed by Linus Torvalds
parent a451751172
commit 27daabd9b6
1 changed files with 4 additions and 2 deletions
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6
lib/scatterlist.c
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@ -247,13 +247,15 @@ int __sg_alloc_table(struct sg_table *table, unsigned int nents,
struct scatterlist *sg, *prv; struct scatterlist *sg, *prv;
unsigned int left; unsigned int left;
memset(table, 0, sizeof(*table));
if (nents == 0)
return -EINVAL;
#ifndef ARCH_HAS_SG_CHAIN #ifndef ARCH_HAS_SG_CHAIN
if (WARN_ON_ONCE(nents > max_ents)) if (WARN_ON_ONCE(nents > max_ents))
return -EINVAL; return -EINVAL;
#endif #endif
memset(table, 0, sizeof(*table));
left = nents; left = nents;
prv = NULL; prv = NULL;
do { do {