From 97f4ed3b71cca015e82bb601a17cd816b83fff05 Mon Sep 17 00:00:00 2001 From: Prasad J Pandit Date: Thu, 11 Feb 2016 11:17:32 +0000 Subject: 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 Signed-off-by: Prasad J Pandit Reviewed-by: Peter Maydell Message-id: 1453315857-1352-1-git-send-email-ppandit@redhat.com Signed-off-by: Peter Maydell --- hw/sd/sd.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'hw') diff --git a/hw/sd/sd.c b/hw/sd/sd.c index 7580449..dd614b0 100644 --- a/hw/sd/sd.c +++ b/hw/sd/sd.c @@ -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, -- cgit v1.1