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From: Shreyansh Chouhan <chouhan.shreyansh630@gmail.com>
To: herbert@gondor.apana.org.au, davem@davemloft.net,
	tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
	x86@kernel.org, hpa@zytor.com, ardb@kernel.org
Cc: Shreyansh Chouhan <chouhan.shreyansh630@gmail.com>,
	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
	syzbot+20191dc583eff8602d2d@syzkaller.appspotmail.com
Subject: [PATCH] crypto: xts_crypt() return if walk.nbytes is 0
Date: Mon,  9 Aug 2021 19:40:27 +0530	[thread overview]
Message-ID: <20210809141027.860850-1-chouhan.shreyansh630@gmail.com> (raw)
In-Reply-To: <YQ0Qm+Xs1g/7Eant@fedora>

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>
---
 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..ec6eac57c493 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 (err || !walk.nbytes)
 		return err;
 
 	if (unlikely(tail > 0 && walk.nbytes < walk.total)) {
-- 
2.31.1


  reply	other threads:[~2021-08-09 14:10 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30 13:41 [PATCH] crypto: add missing kernel_fpu_end() call Shreyansh Chouhan
2021-08-06  8:23 ` Herbert Xu
2021-08-06  9:05   ` Ard Biesheuvel
2021-08-06  9:07     ` Ard Biesheuvel
2021-08-06 10:36       ` Shreyansh Chouhan
2021-08-09 14:10         ` Shreyansh Chouhan [this message]
2021-08-17 14:18           ` [PATCH] crypto: xts_crypt() return if walk.nbytes is 0 Ard Biesheuvel
2021-08-20  8:31           ` Herbert Xu
2021-08-20 11:14             ` Ard Biesheuvel
2021-08-20 12:53               ` Herbert Xu
2021-08-22  3:45                 ` [PATCH v2] " Shreyansh Chouhan
2021-08-27  8:38                   ` Herbert Xu
2021-08-22  3:48                 ` [PATCH] " Shreyansh Chouhan
2021-08-22 13:23                 ` Ard Biesheuvel

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