From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AG47ELucWojMw7yQ0yBI3VSNXYKA7AZBBuGV04HBVTKWnTM0Xdh1V6/xD7odIiXv3Q9TII9bUXXE ARC-Seal: i=1; a=rsa-sha256; t=1521214874; cv=none; d=google.com; s=arc-20160816; b=ClPEh6y/MmPjE9UwjFwQcKrzJ0gha5a+DFw7FMIsCKG21EMtD/F5RLlVecDCueT2is RQZOyfx8fZUx3ZbJ7oFJSKTfK2Bdrqn5w6ry97kSmlXPKr3kCM2gOHfr5phwUEjSTjg/ L2ym5FqmSFclw5bcX0oxKECtPdlUT3MLSA6xZcOmDzqWs8B0PFRZjXNDhUSC1DprQN1s xhxD3xdtxSzV9anEv7R8/867Fu++3jdwXw9h2poA03C1EXxuJctfS7Vnkn+tsFNseCBD 51pfJcmZo2RleGXlXFrtf3TOxdHcQ7WPdC2SrAZeta6An0CSkmb7F/sV8Uw3StQwKPWi fL8w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=vBYzg1bJNIS0KASnz3M3LslSLgu3dh2llWhjABXH4Ic=; b=ciRzIJiFqzCbxLjMhOhydqxzMdFfB9EmJBo40G9Yczejfvk+YHa7M+l+32own+DUYs P0c76hcTNxz8GVvwxrMnia0rnFPvDwVJ4Cz14aPYpIxOK8wNN73TIyTLdKxVBfQNqkGL c8+E3ND9j+2kZtYpZHFv+f/5OtN6bzLDw578w8tuN/Ko7ozCsQn9J+hbmdp2FiFdA7xT 17Rd4YhRIGznej6hsmTWZLAmAIIPvCXnwfOkhgVAp/jYsclf3sNcxnDE8zdzkr3Q/qBR s/xqE4JKPVZD7mFdKO1+0aHLeDNHs7aJZvgYJMOv54Br3xWbtZWOH0/x5mvg+kf29+gS utLw== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pierre Ducroquet , PrasannaKumar Muralidharan , Herbert Xu , Sasha Levin Subject: [PATCH 4.15 049/128] crypto: ecc - Fix NULL pointer deref. on no default_rng Date: Fri, 16 Mar 2018 16:23:10 +0100 Message-Id: <20180316152339.283206824@linuxfoundation.org> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180316152336.199007505@linuxfoundation.org> References: <20180316152336.199007505@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1595109054048113937?= X-GMAIL-MSGID: =?utf-8?q?1595109407711523203?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pierre [ Upstream commit 4c0e22c90510308433272d7ba281b1eb4eda8209 ] If crypto_get_default_rng returns an error, the function ecc_gen_privkey should return an error. Instead, it currently tries to use the default_rng nevertheless, thus creating a kernel panic with a NULL pointer dereference. Returning the error directly, as was supposedly intended when looking at the code, fixes this. Signed-off-by: Pierre Ducroquet Reviewed-by: PrasannaKumar Muralidharan Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- crypto/ecc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/crypto/ecc.c +++ b/crypto/ecc.c @@ -964,7 +964,7 @@ int ecc_gen_privkey(unsigned int curve_i * DRBG with a security strength of 256. */ if (crypto_get_default_rng()) - err = -EFAULT; + return -EFAULT; err = crypto_rng_get_bytes(crypto_default_rng, (u8 *)priv, nbytes); crypto_put_default_rng();