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author | Herbert Xu <herbert@gondor.apana.org.au> | 2007-12-14 00:44:11 +0800 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2008-01-11 08:16:54 +1100 |
commit | 92631156d8a417295eecae6e8b163b6612e62ec4 (patch) | |
tree | 3d87cc50319fa578d52cfccf5075d1f2377f9999 /crypto/scatterwalk.c | |
parent | a171250096d03fa8fd76eb019fb488950cd28162 (diff) | |
download | linux-crypto-92631156d8a417295eecae6e8b163b6612e62ec4.tar.gz linux-crypto-92631156d8a417295eecae6e8b163b6612e62ec4.zip |
[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>
Diffstat (limited to '')
-rw-r--r-- | crypto/scatterwalk.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/crypto/scatterwalk.c b/crypto/scatterwalk.c index 297e19d1..9aeeb520 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); |