From: Ryan Hsu <ryanhsu@codeaurora.org>
Date: Tue, 16 Jan 2018 09:43:49 +0000 (+0200)
Subject: ath10k: add sanity check to ie_len before parsing fw/board ie
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=9ed4f91628737c820af6a1815b65bc06bd31518f;p=openwrt%2Fstaging%2Fblogic.git

ath10k: add sanity check to ie_len before parsing fw/board ie

Validate ie_len after the alignment padding before access the buffer
to avoid potential overflow.

Signed-off-by: Ryan Hsu <ryanhsu@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
---

diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
index fe9341c97f31..c60d91328b5f 100644
--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -1276,7 +1276,10 @@ static int ath10k_core_fetch_board_data_api_n(struct ath10k *ar,
 		len -= sizeof(*hdr);
 		data = hdr->data;
 
-		if (len < ALIGN(ie_len, 4)) {
+		/* jump over the padding */
+		ie_len = ALIGN(ie_len, 4);
+
+		if (len < ie_len) {
 			ath10k_err(ar, "invalid length for board ie_id %d ie_len %zu len %zu\n",
 				   ie_id, ie_len, len);
 			ret = -EINVAL;
@@ -1315,8 +1318,6 @@ static int ath10k_core_fetch_board_data_api_n(struct ath10k *ar,
 			goto out;
 		}
 
-		/* jump over the padding */
-		ie_len = ALIGN(ie_len, 4);
 
 		len -= ie_len;
 		data += ie_len;
@@ -1448,6 +1449,9 @@ int ath10k_core_fetch_firmware_api_n(struct ath10k *ar, const char *name,
 		len -= sizeof(*hdr);
 		data += sizeof(*hdr);
 
+		/* jump over the padding */
+		ie_len = ALIGN(ie_len, 4);
+
 		if (len < ie_len) {
 			ath10k_err(ar, "invalid length for FW IE %d (%zu < %zu)\n",
 				   ie_id, len, ie_len);
@@ -1553,9 +1557,6 @@ int ath10k_core_fetch_firmware_api_n(struct ath10k *ar, const char *name,
 			break;
 		}
 
-		/* jump over the padding */
-		ie_len = ALIGN(ie_len, 4);
-
 		len -= ie_len;
 		data += ie_len;
 	}