This prevents dm_split_args() from corrupting this struct.

Signed-off-by: Demi Marie Obenour demi@invisiblethingslab.com Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org --- drivers/md/dm-ioctl.c | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index 64e8f16d344c47057de5e2d29e3d63202197dca0..a1d5fe64e1d0d9d3dcb06924249b89fe661944ab 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -1444,6 +1444,12 @@ static int populate_table(struct dm_table *table, return -EINVAL; }

+ if (next < sizeof(struct dm_ioctl)) { + DMERR("%s: first target spec (offset %u) overlaps 'struct dm_ioctl'", + __func__, next); + return -EINVAL; + } + for (i = 0; i < param->target_count; i++) {

r = next_target(spec, next, end, &spec, &target_params);