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iwmc3200wifi: fix a use-after-free bug

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The patch fixes a use-after-free bug for cmd->seq_num;

Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Zhu Yi 2009-07-20 11:47:47 +08:00 committed by John W. Linville
parent 9c7c0cdd24
commit 971ad01169
1 changed files with 9 additions and 7 deletions
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12
drivers/net/wireless/iwmc3200wifi/hal.c
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@ -105,7 +105,7 @@
#include "umac.h"
#include "debug.h"
static void iwm_nonwifi_cmd_init(struct iwm_priv *iwm,
static int iwm_nonwifi_cmd_init(struct iwm_priv *iwm,
struct iwm_nonwifi_cmd *cmd,
struct iwm_udma_nonwifi_cmd *udma_cmd)
{
@ -118,7 +118,7 @@ static void iwm_nonwifi_cmd_init(struct iwm_priv *iwm,
cmd->seq_num = iwm->nonwifi_seq_num;
udma_cmd->seq_num = cpu_to_le16(cmd->seq_num);
cmd->seq_num = iwm->nonwifi_seq_num++;
iwm->nonwifi_seq_num++;
iwm->nonwifi_seq_num %= UMAC_NONWIFI_SEQ_NUM_MAX;
if (udma_cmd->resp)
@ -130,6 +130,8 @@ static void iwm_nonwifi_cmd_init(struct iwm_priv *iwm,
cmd->buf.len = 0;
memcpy(&cmd->udma_cmd, udma_cmd, sizeof(*udma_cmd));
return cmd->seq_num;
}
u16 iwm_alloc_wifi_cmd_seq(struct iwm_priv *iwm)
@ -369,7 +371,7 @@ int iwm_hal_send_target_cmd(struct iwm_priv *iwm,
const void *payload)
{
struct iwm_nonwifi_cmd *cmd;
int ret;
int ret, seq_num;
cmd = kzalloc(sizeof(struct iwm_nonwifi_cmd), GFP_KERNEL);
if (!cmd) {
@ -377,7 +379,7 @@ int iwm_hal_send_target_cmd(struct iwm_priv *iwm,
return -ENOMEM;
}
iwm_nonwifi_cmd_init(iwm, cmd, udma_cmd);
seq_num = iwm_nonwifi_cmd_init(iwm, cmd, udma_cmd);
if (cmd->udma_cmd.opcode == UMAC_HDI_OUT_OPCODE_WRITE ||
cmd->udma_cmd.opcode == UMAC_HDI_OUT_OPCODE_WRITE_PERSISTENT) {
@ -393,7 +395,7 @@ int iwm_hal_send_target_cmd(struct iwm_priv *iwm,
if (ret < 0)
return ret;
return cmd->seq_num;
return seq_num;
}
static void iwm_build_lmac_hdr(struct iwm_priv *iwm, struct iwm_lmac_hdr *hdr,