From 9ed4f91628737c820af6a1815b65bc06bd31518f Mon Sep 17 00:00:00 2001
From: Ryan Hsu <ryanhsu@codeaurora.org>
Date: Tue, 16 Jan 2018 11:43:49 +0200
Subject: [PATCH] ath10k: add sanity check to ie_len before parsing fw/board ie
Git-commit: 9ed4f91628737c820af6a1815b65bc06bd31518f
Patch-mainline: v4.16-rc1
References: FATE#326906
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/net/wireless/ath/ath10k/core.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
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;
}
--
2.19.2