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| author | Sean Young <sean@mess.org> | 2019-11-10 11:25:13 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-01-03 16:18:10 +0100 |
| commit | 26cff637121d8bb866ebd6515c430ac890e6ec80 (patch) | |
| tree | 5be42333e3277441ead55f4328279a5d21041425 /drivers/media | |
| parent | 51d0c99b391f0cac61ad7b827c26f549ee55672c (diff) | |
| download | linux-26cff637121d8bb866ebd6515c430ac890e6ec80.tar.gz linux-26cff637121d8bb866ebd6515c430ac890e6ec80.tar.bz2 linux-26cff637121d8bb866ebd6515c430ac890e6ec80.zip | |
media: vp7045: do not read uninitialized values if usb transfer fails
It is not a fatal error if reading the mac address or the remote control
decoder state fails.
Reported-by: syzbot+ec869945d3dde5f33b43@syzkaller.appspotmail.com
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/usb/dvb-usb/vp7045.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/drivers/media/usb/dvb-usb/vp7045.c b/drivers/media/usb/dvb-usb/vp7045.c index 80c1cf05384b..2baf57216d19 100644 --- a/drivers/media/usb/dvb-usb/vp7045.c +++ b/drivers/media/usb/dvb-usb/vp7045.c @@ -96,10 +96,14 @@ static int vp7045_power_ctrl(struct dvb_usb_device *d, int onoff) static int vp7045_rc_query(struct dvb_usb_device *d) { + int ret; u8 key; - vp7045_usb_op(d,RC_VAL_READ,NULL,0,&key,1,20); - deb_rc("remote query key: %x %d\n",key,key); + ret = vp7045_usb_op(d, RC_VAL_READ, NULL, 0, &key, 1, 20); + if (ret) + return ret; + + deb_rc("remote query key: %x\n", key); if (key != 0x44) { /* @@ -115,15 +119,18 @@ static int vp7045_rc_query(struct dvb_usb_device *d) static int vp7045_read_eeprom(struct dvb_usb_device *d,u8 *buf, int len, int offset) { - int i = 0; - u8 v,br[2]; + int i, ret; + u8 v, br[2]; for (i=0; i < len; i++) { v = offset + i; - vp7045_usb_op(d,GET_EE_VALUE,&v,1,br,2,5); + ret = vp7045_usb_op(d, GET_EE_VALUE, &v, 1, br, 2, 5); + if (ret) + return ret; + buf[i] = br[1]; } - deb_info("VP7045 EEPROM read (offs: %d, len: %d) : ",offset, i); - debug_dump(buf,i,deb_info); + deb_info("VP7045 EEPROM read (offs: %d, len: %d) : ", offset, i); + debug_dump(buf, i, deb_info); return 0; } |