From 38c84dfafed5b1193d083e0121ccd985ce5f5bdc Mon Sep 17 00:00:00 2001
From: Shreyansh Chouhan <chouhan.shreyansh630@gmail.com>
Date: Sun, 22 Aug 2021 09:15:14 +0530
Subject: [PATCH] crypto: aesni - xts_crypt() return if walk.nbytes is 0
Git-commit: 72ff2bf04db2a48840df93a461b7115900f46c05
Patch-mainline: v5.15-rc1
References: stable-5.14.10
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 <chouhan.shreyansh630@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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 388643ca2177..0fc961bef299 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)) {
--
2.26.2