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([2405:201:6008:6ce2:9fb0:9db:90a4:39e2]) by smtp.googlemail.com with ESMTPSA id 136sm13841275pge.77.2021.08.21.20.45.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 21 Aug 2021 20:45:22 -0700 (PDT) From: Shreyansh Chouhan To: herbert@gondor.apana.org.au, davem@davemloft.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, x86@kernel.org, ardb@kernel.org Cc: Shreyansh Chouhan , linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+20191dc583eff8602d2d@syzkaller.appspotmail.com Subject: [PATCH v2] crypto: xts_crypt() return if walk.nbytes is 0 Date: Sun, 22 Aug 2021 09:15:14 +0530 Message-Id: <20210822034514.926652-1-chouhan.shreyansh630@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210820125315.GB28484@gondor.apana.org.au> References: <20210820125315.GB28484@gondor.apana.org.au> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org 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 --- 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