diff options
| author | Denis Efremov <[email protected]> | 2019-07-12 21:55:21 +0300 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2019-07-17 14:45:49 -0700 |
| commit | 5635f897ed83fd539df78e98ba69ee91592f9bb8 (patch) | |
| tree | cc7a5fc94670775c0fb7c8e556c9079b08b9f7cd /net/lapb/lapb_subr.c | |
| parent | f3554aeb991214cbfafd17d55e2bfddb50282e32 (diff) | |
floppy: fix out-of-bounds read in next_valid_format
This fixes a global out-of-bounds read access in the next_valid_format
function of the floppy driver.
The values from autodetect field of the struct floppy_drive_params are
used as indices for the floppy_type array in the next_valid_format
function 'floppy_type[DP->autodetect[probed_format]].sect'.
To trigger the bug, one could use a value out of range and set the drive
parameters with the FDSETDRVPRM ioctl. A floppy disk is not required to
be inserted.
CAP_SYS_ADMIN is required to call FDSETDRVPRM.
The patch adds the check for values of the autodetect field to be in the
'0 <= x < ARRAY_SIZE(floppy_type)' range of the floppy_type array indices.
The bug was found by syzkaller.
Signed-off-by: Denis Efremov <[email protected]>
Tested-by: Willy Tarreau <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'net/lapb/lapb_subr.c')
0 files changed, 0 insertions, 0 deletions