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| author | Suresh Jayaraman <sjayaraman@suse.de> | 2009-09-30 10:53:48 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-10-01 21:15:46 +0200 |
| commit | 3bd0f0c763e497c8674b28e3df2732f48683dabd (patch) | |
| tree | fd3bb8635291ad8c0b4e302e40cc776fd1644ada /block/blk-barrier.c | |
| parent | a112a71d45b5e40c3cf07371d20a4a5079a72610 (diff) | |
| download | lwn-3bd0f0c763e497c8674b28e3df2732f48683dabd.tar.gz lwn-3bd0f0c763e497c8674b28e3df2732f48683dabd.zip | |
swapfile: avoid NULL pointer dereference in swapon when s_bdev is NULL
While testing Swap over NFS patchset, I noticed an oops that was triggered
during swapon. Investigating further, the NULL pointer deference is due to the
SSD device check/optimization in the swapon code that assumes s_bdev could never
be NULL.
inode->i_sb->s_bdev could be NULL in a few cases. For e.g. one such case is
loopback NFS mount, there could be others as well. Fix this by ensuring s_bdev
is not NULL before we try to deference s_bdev.
Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-barrier.c')
0 files changed, 0 insertions, 0 deletions