From: Baochen Qiang <quic_bqiang@xxxxxxxxxxx> [ Upstream commit 1bc44a505a229bb1dd4957e11aa594edeea3690e ] len is extracted from HTT message and could be an unexpected value in case errors happen, so add validation before using to avoid possible out-of-bound read in the following message iteration and parsing. The same issue also applies to ppdu_info->ppdu_stats.common.num_users, so validate it before using too. These are found during code review. Compile test only. Signed-off-by: Baochen Qiang <quic_bqiang@xxxxxxxxxxx> Acked-by: Jeff Johnson <quic_jjohnson@xxxxxxxxxxx> Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx> Link: https://lore.kernel.org/r/20230901015602.45112-1-quic_bqiang@xxxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/net/wireless/ath/ath12k/dp_rx.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/net/wireless/ath/ath12k/dp_rx.c b/drivers/net/wireless/ath/ath12k/dp_rx.c index 100390fdc735f..42f9cfede12bf 100644 --- a/drivers/net/wireless/ath/ath12k/dp_rx.c +++ b/drivers/net/wireless/ath/ath12k/dp_rx.c @@ -1555,6 +1555,13 @@ static int ath12k_htt_pull_ppdu_stats(struct ath12k_base *ab, msg = (struct ath12k_htt_ppdu_stats_msg *)skb->data; len = le32_get_bits(msg->info, HTT_T2H_PPDU_STATS_INFO_PAYLOAD_SIZE); + if (len > (skb->len - struct_size(msg, data, 0))) { + ath12k_warn(ab, + "HTT PPDU STATS event has unexpected payload size %u, should be smaller than %u\n", + len, skb->len); + return -EINVAL; + } + pdev_id = le32_get_bits(msg->info, HTT_T2H_PPDU_STATS_INFO_PDEV_ID); ppdu_id = le32_to_cpu(msg->ppdu_id); @@ -1583,6 +1590,16 @@ static int ath12k_htt_pull_ppdu_stats(struct ath12k_base *ab, goto exit; } + if (ppdu_info->ppdu_stats.common.num_users >= HTT_PPDU_STATS_MAX_USERS) { + spin_unlock_bh(&ar->data_lock); + ath12k_warn(ab, + "HTT PPDU STATS event has unexpected num_users %u, should be smaller than %u\n", + ppdu_info->ppdu_stats.common.num_users, + HTT_PPDU_STATS_MAX_USERS); + ret = -EINVAL; + goto exit; + } + /* back up data rate tlv for all peers */ if (ppdu_info->frame_type == HTT_STATS_PPDU_FTYPE_DATA && (ppdu_info->tlv_bitmap & (1 << HTT_PPDU_STATS_TAG_USR_COMMON)) && -- 2.42.0
