[PATCH] ath10k: fix out of bounds access to local buffer

[Michael Mera]

During write to debugfs file simulate_fw_crash, fixed-size local buffer
'buf' is accessed and modified at index 'count-1', where 'count' is the
size of the write (so potentially out of bounds).
This patch fixes this problem.

Signed-off-by: Michael Mera <d...@michaelmera.com>
---
 drivers/net/wireless/ath/ath10k/debug.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/debug.c 
b/drivers/net/wireless/ath/ath10k/debug.c
index fb0ade3adb07..7f3c17e55693 100644
--- a/drivers/net/wireless/ath/ath10k/debug.c
+++ b/drivers/net/wireless/ath/ath10k/debug.c
@@ -628,17 +628,21 @@ static ssize_t ath10k_write_simulate_fw_crash(struct file 
*file,
                                              size_t count, loff_t *ppos)
 {
        struct ath10k *ar = file->private_data;
-       char buf[32];
+       char buf[32] = {0};
+       ssize_t rc;
        int ret;
 
-       simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, user_buf, count);
+       /* filter partial writes and invalid commands */
+       if (*ppos != 0 || count >= sizeof(buf) || count == 0)
+               return -EINVAL;
 
-       /* make sure that buf is null terminated */
-       buf[sizeof(buf) - 1] = 0;
+       rc = simple_write_to_buffer(buf, sizeof(buf)-1, ppos, user_buf, count);
+       if (rc < 0)
+               return rc;
 
        /* drop the possible '\n' from the end */
-       if (buf[count - 1] == '\n')
-               buf[count - 1] = 0;
+       if (buf[*ppos - 1] == '\n')
+               buf[*ppos - 1] = '\0';
 
        mutex_lock(&ar->conf_mutex);
 
-- 
2.9.3