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authorMiaoqing Pan <miaoqing@codeaurora.org>2017-09-27 09:13:34 +0800
committerKalle Valo <kvalo@qca.qualcomm.com>2017-10-13 14:40:57 +0300
commitee0a47186e2fa9aa1c56cadcea470ca0ba8c8692 (patch)
tree429b8cb7c2975c35d5a5af2e595aeb2446de5153
parent2ea9f12cefe4b6bf291e1717512b0ccb04bf71e9 (diff)
ath9k: fix tx99 potential info leak
When the user sets count to zero the string buffer would remain completely uninitialized which causes the kernel to parse its own stack data, potentially leading to an info leak. In addition to that, the string might be not terminated properly when the user data does not contain a 0-terminator. Signed-off-by: Miaoqing Pan <miaoqing@codeaurora.org> Reviewed-by: Christoph Böhmwalder <christoph@boehmwalder.at> Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
-rw-r--r--drivers/net/wireless/ath/ath9k/tx99.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/tx99.c b/drivers/net/wireless/ath/ath9k/tx99.c
index 49ed1afb913c..fe3a8263b224 100644
--- a/drivers/net/wireless/ath/ath9k/tx99.c
+++ b/drivers/net/wireless/ath/ath9k/tx99.c
@@ -179,6 +179,9 @@ static ssize_t write_file_tx99(struct file *file, const char __user *user_buf,
ssize_t len;
int r;
+ if (count < 1)
+ return -EINVAL;
+
if (sc->cur_chan->nvifs > 1)
return -EOPNOTSUPP;
@@ -186,6 +189,8 @@ static ssize_t write_file_tx99(struct file *file, const char __user *user_buf,
if (copy_from_user(buf, user_buf, len))
return -EFAULT;
+ buf[len] = '\0';
+
if (strtobool(buf, &start))
return -EINVAL;