From: Bing Zhao <bzhao@marvell.com>
To: <linux-wireless@vger.kernel.org>
Cc: "John W. Linville" <linville@tuxdriver.com>,
Dan Carpenter <dan.carpenter@oracle.com>,
Amitkumar Karwar <akarwar@marvell.com>,
Avinash Patil <patila@marvell.com>,
Nishant Sarmukadam <nishants@marvell.com>,
Frank Huang <frankh@marvell.com>, Bing Zhao <bzhao@marvell.com>
Subject: [PATCH 6/6] mwifiex: improvements in mwifiex_ret_tx_power_cfg()
Date: Tue, 22 Oct 2013 15:24:47 -0700 [thread overview]
Message-ID: <1382480687-12720-7-git-send-email-bzhao@marvell.com> (raw)
In-Reply-To: <1382480687-12720-1-git-send-email-bzhao@marvell.com>
From: Amitkumar Karwar <akarwar@marvell.com>
1) Move common code out of switch case handling
2) Return from the function if number of bytes left in response buffer
are less than tlv size
3) Pass pg_tlv_hdr directly instead of txp_cfg to mwifiex_get_power_level()
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
---
drivers/net/wireless/mwifiex/sta_cmdresp.c | 35 ++++++++++++++----------------
1 file changed, 16 insertions(+), 19 deletions(-)
diff --git a/drivers/net/wireless/mwifiex/sta_cmdresp.c b/drivers/net/wireless/mwifiex/sta_cmdresp.c
index 2675ca7..5511946 100644
--- a/drivers/net/wireless/mwifiex/sta_cmdresp.c
+++ b/drivers/net/wireless/mwifiex/sta_cmdresp.c
@@ -338,8 +338,7 @@ static int mwifiex_get_power_level(struct mwifiex_private *priv, void *data_buf)
if (!data_buf)
return -1;
- pg_tlv_hdr = (struct mwifiex_types_power_group *)
- ((u8 *) data_buf + sizeof(struct host_cmd_ds_txpwr_cfg));
+ pg_tlv_hdr = (struct mwifiex_types_power_group *)((u8 *)data_buf);
pg = (struct mwifiex_power_group *)
((u8 *) pg_tlv_hdr + sizeof(struct mwifiex_types_power_group));
length = le16_to_cpu(pg_tlv_hdr->length);
@@ -383,19 +382,25 @@ static int mwifiex_ret_tx_power_cfg(struct mwifiex_private *priv,
struct mwifiex_types_power_group *pg_tlv_hdr;
struct mwifiex_power_group *pg;
u16 action = le16_to_cpu(txp_cfg->action);
+ u16 tlv_buf_left;
- switch (action) {
- case HostCmd_ACT_GEN_GET:
- pg_tlv_hdr = (struct mwifiex_types_power_group *)
- ((u8 *) txp_cfg +
- sizeof(struct host_cmd_ds_txpwr_cfg));
+ pg_tlv_hdr = (struct mwifiex_types_power_group *)
+ ((u8 *)txp_cfg +
+ sizeof(struct host_cmd_ds_txpwr_cfg));
- pg = (struct mwifiex_power_group *)
- ((u8 *) pg_tlv_hdr +
- sizeof(struct mwifiex_types_power_group));
+ pg = (struct mwifiex_power_group *)
+ ((u8 *)pg_tlv_hdr +
+ sizeof(struct mwifiex_types_power_group));
+ tlv_buf_left = le16_to_cpu(resp->size) - S_DS_GEN - sizeof(*txp_cfg);
+ if (tlv_buf_left <
+ le16_to_cpu(pg_tlv_hdr->length) + sizeof(*pg_tlv_hdr))
+ return 0;
+
+ switch (action) {
+ case HostCmd_ACT_GEN_GET:
if (adapter->hw_status == MWIFIEX_HW_STATUS_INITIALIZING)
- mwifiex_get_power_level(priv, txp_cfg);
+ mwifiex_get_power_level(priv, pg_tlv_hdr);
priv->tx_power_level = (u16) pg->power_min;
break;
@@ -404,14 +409,6 @@ static int mwifiex_ret_tx_power_cfg(struct mwifiex_private *priv,
if (!le32_to_cpu(txp_cfg->mode))
break;
- pg_tlv_hdr = (struct mwifiex_types_power_group *)
- ((u8 *) txp_cfg +
- sizeof(struct host_cmd_ds_txpwr_cfg));
-
- pg = (struct mwifiex_power_group *)
- ((u8 *) pg_tlv_hdr +
- sizeof(struct mwifiex_types_power_group));
-
if (pg->power_max == pg->power_min)
priv->tx_power_level = (u16) pg->power_min;
break;
--
1.8.2.3
prev parent reply other threads:[~2013-10-22 22:25 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-22 22:24 [PATCH 0/6] mwifiex: potential integer underflow and invalid mem access Bing Zhao
2013-10-22 22:24 ` [PATCH 1/6] mwifiex: potential integer underflow in mwifiex_ret_wmm_get_status() Bing Zhao
2013-10-22 22:24 ` [PATCH 2/6] mwifiex: replace u16 with __le16 in struct mwifiex_types_power_group Bing Zhao
2013-10-22 22:24 ` [PATCH 3/6] mwifiex: fix invalid memory access in mwifiex_get_power_level() Bing Zhao
2013-10-22 22:24 ` [PATCH 4/6] mwifiex: fix invalid memory access in mwifiex_ret_tx_rate_cfg() Bing Zhao
2013-10-22 22:24 ` [PATCH 5/6] mwifiex: fix invalid memory access in mwifiex_update_autoindex_ies() Bing Zhao
2013-10-22 22:24 ` Bing Zhao [this message]
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