When reading the firmware and sending commands, the length must be bounds checked to avoid overrunning the size of the command buffer and smashing the stack if the firmware is not in the expected format:
si2168 11-0064: found a 'Silicon Labs Si2168-B40' si2168 11-0064: downloading firmware from file 'dvb-demod-si2168-b40-01.fw' si2168 11-0064: firmware download failed -95 Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffffa085708f Add the proper check. Cc: [email protected] Reported-by: Stuart Auchterlonie <[email protected]> Reviewed-by: Antti Palosaari <[email protected]> Signed-off-by: Laura Abbott <[email protected]> --- drivers/media/dvb-frontends/si2168.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/media/dvb-frontends/si2168.c b/drivers/media/dvb-frontends/si2168.c index 81788c5..821a8f4 100644 --- a/drivers/media/dvb-frontends/si2168.c +++ b/drivers/media/dvb-frontends/si2168.c @@ -502,6 +502,10 @@ static int si2168_init(struct dvb_frontend *fe) /* firmware is in the new format */ for (remaining = fw->size; remaining > 0; remaining -= 17) { len = fw->data[fw->size - remaining]; + if (len > SI2168_ARGLEN) { + ret = -EINVAL; + break; + } memcpy(cmd.args, &fw->data[(fw->size - remaining) + 1], len); cmd.wlen = len; cmd.rlen = 1; -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
