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sd: limit 'req.cmd' while using as an array index 

While processing standard SD commands, the 'req.cmd' value could
lead to OOB read when used as an index into 'sd_cmd_type' or
'sd_cmd_class' arrays. Limit 'req.cmd' value to avoid such an
access.

Reported-by: Qinghao Tang <luodalongde@gmail.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1453315857-1352-1-git-send-email-ppandit@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Prasad J Pandit 2016-02-11 11:17:32 +00:00 committed by Peter Maydell
parent 3826121d92
commit 97f4ed3b71
1 changed files with 5 additions and 2 deletions
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7
hw/sd/sd.c
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@ -669,8 +669,10 @@ static sd_rsp_type_t sd_normal_command(SDState *sd,
/* Not interpreting this as an app command */
sd->card_status &= ~APP_CMD;
if (sd_cmd_type[req.cmd] == sd_ac || sd_cmd_type[req.cmd] == sd_adtc)
if (sd_cmd_type[req.cmd & 0x3F] == sd_ac
|| sd_cmd_type[req.cmd & 0x3F] == sd_adtc) {
rca = req.arg >> 16;
}
DPRINTF("CMD%d 0x%08x state %d\n", req.cmd, req.arg, sd->state);
switch (req.cmd) {
@ -1341,7 +1343,8 @@ static int cmd_valid_while_locked(SDState *sd, SDRequest *req)
if (req->cmd == 16 || req->cmd == 55) {
return 1;
}
return sd_cmd_class[req->cmd] == 0 || sd_cmd_class[req->cmd] == 7;
return sd_cmd_class[req->cmd & 0x3F] == 0
|| sd_cmd_class[req->cmd & 0x3F] == 7;
}
int sd_do_command(SDState *sd, SDRequest *req,