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staging: rtl8723bs: add missing range check on id 

The value of the u8 id needs to be upper bounds checked to ensure
the cam_cache array on the adapter dvobj is not indexed outside
of the allowed range of 0..TOTAL_CAM_ENTRY-1. This can currently
occur if id is >= TOTAL_CAM_ENTRY when calling write_cam_from_cache.
Fix this by adding an upper range check.

Detected by CoverityScan, CID#1428464 ("Use of untrusted scalar value")

Fixes: 554c0a3abf ("staging: Add rtl8723bs sdio wifi driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Colin Ian King 2017-09-20 22:19:57 +01:00 committed by Greg Kroah-Hartman
parent 974d4d03fc
commit c51b46dd5b
1 changed files with 2 additions and 0 deletions
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2
drivers/staging/rtl8723bs/os_dep/rtw_proc.c
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@ -311,6 +311,8 @@ static ssize_t proc_set_cam(struct file *file, const char __user *buffer, size_t
if (num < 2)
return count;
if (id >= TOTAL_CAM_ENTRY)
return -EINVAL;
if (strcmp("c", cmd) == 0) {
_clear_cam_entry(adapter, id);