From 6e050778c5d08a97d5d98f7cb62bc503e872615c Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Fri, 14 Dec 2007 00:44:11 +0800 Subject: [PATCH] [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 --- crypto/scatterwalk.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c index 297e19d13c4e..9aeeb52004a5 100644 --- a/crypto/scatterwalk.c +++ b/crypto/scatterwalk.c @@ -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); -- 2.20.1