[CRYPTO] scatterwalk: Handle zero nbytes in scatterwalk_map_and_copy

It's better to return silently than crash and burn when someone feeds us
a zero length.  In particular the null digest algorithm when used as part
of authenc will do that to us.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2007-12-14 00:44:11 +08:00
parent ce5bd4aca3
commit 6e050778c5

View File

@ -105,6 +105,9 @@ void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
struct scatter_walk walk;
unsigned int offset = 0;
if (!nbytes)
return;
for (;;) {
scatterwalk_start(&walk, sg);