From 38c84dfafed5b1193d083e0121ccd985ce5f5bdc Mon Sep 17 00:00:00 2001 From: Shreyansh Chouhan Date: Sun, 22 Aug 2021 09:15:14 +0530 Subject: [PATCH] crypto: aesni - xts_crypt() return if walk.nbytes is 0 commit 72ff2bf04db2a48840df93a461b7115900f46c05 upstream. 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 Signed-off-by: Herbert Xu Signed-off-by: Greg Kroah-Hartman --- arch/x86/crypto/aesni-intel_glue.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c index 388643ca2177e..0fc961bef299c 100644 --- a/arch/x86/crypto/aesni-intel_glue.c +++ b/arch/x86/crypto/aesni-intel_glue.c @@ -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)) {