Commit 72ff2bf0 authored by Shreyansh Chouhan's avatar Shreyansh Chouhan Committed by Herbert Xu
Browse files

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



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: default avatar <syzbot+20191dc583eff8602d2d@syzkaller.appspotmail.com>
Signed-off-by: default avatarShreyansh Chouhan <chouhan.shreyansh630@gmail.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent cedcf527

arch/x86/crypto/aesni-intel_glue.c

+1 −1
Original line number Diff line number Diff line
@@ -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)) {