renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-15 08:44:14 +08:00
Code

wireless: radiotap: fix parsing buffer overrun

Browse Source 
When parsing an invalid radiotap header, the parser can overrun
the buffer that is passed in because it doesn't correctly check
 1) the minimum radiotap header size
 2) the space for extended bitmaps

The first issue doesn't affect any in-kernel user as they all
check the minimum size before calling the radiotap function.
The second issue could potentially affect the kernel if an skb
is passed in that consists only of the radiotap header with a
lot of extended bitmaps that extend past the SKB. In that case
a read-only buffer overrun by at most 4 bytes is possible.

Fix this by adding the appropriate checks to the parser.

Cc: stable@vger.kernel.org
Reported-by: Evan Huus <eapache@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2013-10-11 14:47:05 +02:00
parent f38dd58ccc
commit f5563318ff
1 changed files with 6 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
net/wireless/radiotap.c
View File

@ -97,6 +97,10 @@ int ieee80211_radiotap_iterator_init(
struct ieee80211_radiotap_header *radiotap_header,
int max_length, const struct ieee80211_radiotap_vendor_namespaces *vns)
{
/* check the radiotap header can actually be present */
if (max_length < sizeof(struct ieee80211_radiotap_header))
return -EINVAL;
/* Linux only supports version 0 radiotap format */
if (radiotap_header->it_version)
return -EINVAL;
@ -131,7 +135,8 @@ int ieee80211_radiotap_iterator_init(
*/
if ((unsigned long)iterator->_arg -
(unsigned long)iterator->_rtheader >
(unsigned long)iterator->_rtheader +
sizeof(uint32_t) >
(unsigned long)iterator->_max_length)
return -EINVAL;
}