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ath10k: fix information leak in debugfs

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During write to some of debugfs in ath10k, few variables exposing stack
data when process user input. which leads to possible information leak.

This patch fix this issue by initializing buffer and checks
the return valure of 'simple_write_to_buffer'.

Signed-off-by: Venkateswara Naralasetty <vnaralas@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Venkateswara Naralasetty 2018-04-25 11:36:40 +03:00 committed by Kalle Valo
parent 51c12756de
commit 2f177c1628
2 changed files with 25 additions and 25 deletions
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20
drivers/net/wireless/ath/ath10k/debug.c
View File

@ -987,13 +987,13 @@ static ssize_t ath10k_write_htt_max_amsdu_ampdu(struct file *file,
{
struct ath10k *ar = file->private_data;
int res;
char buf[64];
char buf[64] = {0};
unsigned int amsdu, ampdu;
simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, user_buf, count);
/* make sure that buf is null terminated */
buf[sizeof(buf) - 1] = 0;
res = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos,
user_buf, count);
if (res <= 0)
return res;
res = sscanf(buf, "%u %u", &amsdu, &ampdu);
@ -1043,14 +1043,14 @@ static ssize_t ath10k_write_fw_dbglog(struct file *file,
{
struct ath10k *ar = file->private_data;
int ret;
char buf[96];
char buf[96] = {0};
unsigned int log_level;
u64 mask;
simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, user_buf, count);
/* make sure that buf is null terminated */
buf[sizeof(buf) - 1] = 0;
ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos,
user_buf, count);
if (ret <= 0)
return ret;
ret = sscanf(buf, "%llx %u", &mask, &log_level);

30
drivers/net/wireless/ath/ath10k/debugfs_sta.c
View File

@ -254,12 +254,12 @@ static ssize_t ath10k_dbg_sta_write_addba(struct file *file,
struct ath10k *ar = arsta->arvif->ar;
u32 tid, buf_size;
int ret;
char buf[64];
char buf[64] = {0};
simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, user_buf, count);
/* make sure that buf is null terminated */
buf[sizeof(buf) - 1] = '\0';
ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos,
user_buf, count);
if (ret <= 0)
return ret;
ret = sscanf(buf, "%u %u", &tid, &buf_size);
if (ret != 2)
@ -305,12 +305,12 @@ static ssize_t ath10k_dbg_sta_write_addba_resp(struct file *file,
struct ath10k *ar = arsta->arvif->ar;
u32 tid, status;
int ret;
char buf[64];
char buf[64] = {0};
simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, user_buf, count);
/* make sure that buf is null terminated */
buf[sizeof(buf) - 1] = '\0';
ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos,
user_buf, count);
if (ret <= 0)
return ret;
ret = sscanf(buf, "%u %u", &tid, &status);
if (ret != 2)
@ -355,12 +355,12 @@ static ssize_t ath10k_dbg_sta_write_delba(struct file *file,
struct ath10k *ar = arsta->arvif->ar;
u32 tid, initiator, reason;
int ret;
char buf[64];
char buf[64] = {0};
simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, user_buf, count);
/* make sure that buf is null terminated */
buf[sizeof(buf) - 1] = '\0';
ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos,
user_buf, count);
if (ret <= 0)
return ret;
ret = sscanf(buf, "%u %u %u", &tid, &initiator, &reason);
if (ret != 3)