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[66.187.233.206]) by smtp.gmail.com with ESMTPSA id bl41-20020a05620a1aa900b007059c5929b8sm14637969qkb.21.2023.01.14.09.01.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Jan 2023 09:01:15 -0800 (PST) From: Tom Rix To: tim@cyberelk.net, axboe@kernel.dk, nathan@kernel.org, ndesaulniers@google.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Tom Rix Subject: [PATCH] paride/pcd: return earlier when an error happens in pcd_atapi() Date: Sat, 14 Jan 2023 12:01:13 -0500 Message-Id: <20230114170113.3985630-1-trix@redhat.com> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" clang static analysis reports drivers/block/paride/pcd.c:856:36: warning: The left operand of '&' is a garbage value [core.UndefinedBinaryOperatorResult] tocentry->cdte_ctrl =3D buffer[5] & 0xf; ~~~~~~~~~ ^ When the call to pcd_atapi() fails, buffer[] is in an unknown state, so return early. Signed-off-by: Tom Rix --- drivers/block/paride/pcd.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/block/paride/pcd.c b/drivers/block/paride/pcd.c index a5ab40784119..4524d8880463 100644 --- a/drivers/block/paride/pcd.c +++ b/drivers/block/paride/pcd.c @@ -827,12 +827,13 @@ static int pcd_audio_ioctl(struct cdrom_device_info *= cdi, unsigned int cmd, void char buffer[32]; int r; =20 - r =3D pcd_atapi(cd, cmd, 12, buffer, "read toc header"); + if (pcd_atapi(cd, cmd, 12, buffer, "read toc header")) + return -EIO; =20 tochdr->cdth_trk0 =3D buffer[2]; tochdr->cdth_trk1 =3D buffer[3]; =20 - return r ? -EIO : 0; + return 0; } =20 case CDROMREADTOCENTRY: @@ -845,13 +846,13 @@ static int pcd_audio_ioctl(struct cdrom_device_info *= cdi, unsigned int cmd, void struct cdrom_tocentry *tocentry =3D (struct cdrom_tocentry *) arg; unsigned char buffer[32]; - int r; =20 cmd[1] =3D (tocentry->cdte_format =3D=3D CDROM_MSF ? 0x02 : 0); cmd[6] =3D tocentry->cdte_track; =20 - r =3D pcd_atapi(cd, cmd, 12, buffer, "read toc entry"); + if (pcd_atapi(cd, cmd, 12, buffer, "read toc entry")) + return -EIO; =20 tocentry->cdte_ctrl =3D buffer[5] & 0xf; tocentry->cdte_adr =3D buffer[5] >> 4; @@ -866,7 +867,7 @@ static int pcd_audio_ioctl(struct cdrom_device_info *cd= i, unsigned int cmd, void (((((buffer[8] << 8) + buffer[9]) << 8) + buffer[10]) << 8) + buffer[11]; =20 - return r ? -EIO : 0; + return 0; } =20 default: --=20 2.27.0