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crypto: aesni - xts_crypt() return if walk.nbytes is 0

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xts_crypt() code doesn't call kernel_fpu_end() after calling
kernel_fpu_begin() if walk.nbytes is 0. The correct behavior should be
not calling kernel_fpu_begin() if walk.nbytes is 0.

Reported-by: syzbot+20191dc583eff8602d2d@syzkaller.appspotmail.com
Signed-off-by: Shreyansh Chouhan <chouhan.shreyansh630@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Shreyansh Chouhan 2021-08-22 09:15:14 +05:30 committed by Herbert Xu
parent cedcf527d5
commit 72ff2bf04d
1 changed files with 1 additions and 1 deletions
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2
arch/x86/crypto/aesni-intel_glue.c
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@ -849,7 +849,7 @@ static int xts_crypt(struct skcipher_request *req, bool encrypt)
return -EINVAL;
err = skcipher_walk_virt(&walk, req, false);
if (err)
if (!walk.nbytes)
return err;
if (unlikely(tail > 0 && walk.nbytes < walk.total)) {