diff options
author | Wenwen Wang <wang6495@umn.edu> | 2018-10-05 10:59:36 -0500 |
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committer | David S. Miller <davem@davemloft.net> | 2018-10-05 11:54:55 -0700 |
commit | 0781168e23a2fc8dceb989f11fc5b39b3ccacc35 (patch) | |
tree | 2712d98048d8297fa79067427e0a251e5fc72f90 /drivers/net/wireless/atmel | |
parent | 33aa8da1f8a7dc050b9d68f1db761ab787621065 (diff) |
yam: fix a missing-check bug
In yam_ioctl(), the concrete ioctl command is firstly copied from the
user-space buffer 'ifr->ifr_data' to 'ioctl_cmd' and checked through the
following switch statement. If the command is not as expected, an error
code EINVAL is returned. In the following execution the buffer
'ifr->ifr_data' is copied again in the cases of the switch statement to
specific data structures according to what kind of ioctl command is
requested. However, after the second copy, no re-check is enforced on the
newly-copied command. Given that the buffer 'ifr->ifr_data' is in the user
space, a malicious user can race to change the command between the two
copies. This way, the attacker can inject inconsistent data and cause
undefined behavior.
This patch adds a re-check in each case of the switch statement if there is
a second copy in that case, to re-check whether the command obtained in the
second copy is the same as the one in the first copy. If not, an error code
EINVAL will be returned.
Signed-off-by: Wenwen Wang <wang6495@umn.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/wireless/atmel')
0 files changed, 0 insertions, 0 deletions