mwifiex: fix invalid memory access in mwifiex_update_autoindex_ies()
While parsing TLVs, return failure if number of remaining bytes
are less than current tlv length. This avoids invalid memory
access.
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/mwifiex/ie.c b/drivers/net/wireless/mwifiex/ie.c
index 220af4f..81ac001 100644
--- a/drivers/net/wireless/mwifiex/ie.c
+++ b/drivers/net/wireless/mwifiex/ie.c
@@ -82,7 +82,7 @@
struct mwifiex_ie_list *ie_list)
{
u16 travel_len, index, mask;
- s16 input_len;
+ s16 input_len, tlv_len;
struct mwifiex_ie *ie;
u8 *tmp;
@@ -91,11 +91,13 @@
ie_list->len = 0;
- while (input_len > 0) {
+ while (input_len >= sizeof(struct mwifiex_ie_types_header)) {
ie = (struct mwifiex_ie *)(((u8 *)ie_list) + travel_len);
- input_len -= le16_to_cpu(ie->ie_length) + MWIFIEX_IE_HDR_SIZE;
- travel_len += le16_to_cpu(ie->ie_length) + MWIFIEX_IE_HDR_SIZE;
+ tlv_len = le16_to_cpu(ie->ie_length);
+ travel_len += tlv_len + MWIFIEX_IE_HDR_SIZE;
+ if (input_len < tlv_len + MWIFIEX_IE_HDR_SIZE)
+ return -1;
index = le16_to_cpu(ie->ie_index);
mask = le16_to_cpu(ie->mgmt_subtype_mask);
@@ -132,6 +134,7 @@
le16_add_cpu(&ie_list->len,
le16_to_cpu(priv->mgmt_ie[index].ie_length) +
MWIFIEX_IE_HDR_SIZE);
+ input_len -= tlv_len + MWIFIEX_IE_HDR_SIZE;
}
if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP)