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mwifiex: fix invalid memory access in mwifiex_ret_tx_rate_cfg()

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As tlv_buf_len is decremented at the end of the loop, we may have
accessed invalid memory in the last iteration.
Modify the while condition and add a break statement at the
begining of the loop to fix the problem.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
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>
This commit is contained in:
Amitkumar Karwar 2013-10-22 15:24:45 -07:00 committed by John W. Linville
parent fe1c9a443e
commit 2636c308fd
1 changed files with 12 additions and 10 deletions
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22
drivers/net/wireless/mwifiex/sta_cmdresp.c
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@ -274,17 +274,20 @@ static int mwifiex_ret_tx_rate_cfg(struct mwifiex_private *priv,
struct host_cmd_ds_tx_rate_cfg *rate_cfg = &resp->params.tx_rate_cfg;
struct mwifiex_rate_scope *rate_scope;
struct mwifiex_ie_types_header *head;
u16 tlv, tlv_buf_len;
u16 tlv, tlv_buf_len, tlv_buf_left;
u8 *tlv_buf;
u32 i;
tlv_buf = ((u8 *)rate_cfg) +
sizeof(struct host_cmd_ds_tx_rate_cfg);
tlv_buf_len = le16_to_cpu(*(__le16 *) (tlv_buf + sizeof(u16)));
tlv_buf = ((u8 *)rate_cfg) + sizeof(struct host_cmd_ds_tx_rate_cfg);
tlv_buf_left = le16_to_cpu(resp->size) - S_DS_GEN - sizeof(*rate_cfg);
while (tlv_buf && tlv_buf_len > 0) {
tlv = (*tlv_buf);
tlv = tlv | (*(tlv_buf + 1) << 8);
while (tlv_buf_left >= sizeof(*head)) {
head = (struct mwifiex_ie_types_header *)tlv_buf;
tlv = le16_to_cpu(head->type);
tlv_buf_len = le16_to_cpu(head->len);
if (tlv_buf_left < (sizeof(*head) + tlv_buf_len))
break;
switch (tlv) {
case TLV_TYPE_RATE_SCOPE:
@ -304,9 +307,8 @@ static int mwifiex_ret_tx_rate_cfg(struct mwifiex_private *priv,
/* Add RATE_DROP tlv here */
}
head = (struct mwifiex_ie_types_header *) tlv_buf;
tlv_buf += le16_to_cpu(head->len) + sizeof(*head);
tlv_buf_len -= le16_to_cpu(head->len);
tlv_buf += (sizeof(*head) + tlv_buf_len);
tlv_buf_left -= (sizeof(*head) + tlv_buf_len);
}
priv->is_data_rate_auto = mwifiex_is_rate_auto(priv);