linux-kernel - [PATCH v2] crypto: xts_crypt() return if walk.nbytes is 0

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Message-Id: <20210822034514.926652-1-chouhan.shreyansh630@gmail.com>
Date:   Sun, 22 Aug 2021 09:15:14 +0530
From:   Shreyansh Chouhan <chouhan.shreyansh630@...il.com>
To:     herbert@...dor.apana.org.au, davem@...emloft.net,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        x86@...nel.org, ardb@...nel.org
Cc:     Shreyansh Chouhan <chouhan.shreyansh630@...il.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzbot+20191dc583eff8602d2d@...kaller.appspotmail.com
Subject: [PATCH v2] crypto: 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: syzbot+20191dc583eff8602d2d@...kaller.appspotmail.com
Signed-off-by: Shreyansh Chouhan <chouhan.shreyansh630@...il.com>
---
 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)) {
-- 
2.31.1