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| author | Prasad Joshi <prasadjoshi.linux@gmail.com> | 2012-04-02 09:23:04 +0530 |
|---|---|---|
| committer | Prasad Joshi <prasadjoshi.linux@gmail.com> | 2012-04-02 18:04:00 +0530 |
| commit | cd8bfa9c8a13cf3facc5731da17e10188b3795d1 (patch) | |
| tree | 29dc3a2967d8a54528f39b1a631c68741a2a2197 /fs/logfs | |
| parent | d2dcd9083f101584e029cbd4f0e1a4e573170d43 (diff) | |
| download | lwn-cd8bfa9c8a13cf3facc5731da17e10188b3795d1.tar.gz lwn-cd8bfa9c8a13cf3facc5731da17e10188b3795d1.zip | |
logfs: initialize the number of iovecs in bio
This fixes the following crash when a LogFS file system, created on a
encrypted LVM volume, was mounted
[ 526.548034] BUG: unable to handle kernel NULL pointer dereference at
[ 526.550106] IP: [<ffffffff8131ecab>] memcpy+0xb/0x120
[ 526.551008] PGD bd60067 PUD 1778d067 PMD 0
[ 526.551783] Oops: 0000 [#1] SMP
<d>Pid: 2043, comm: mount
<d>RIP: 0010:[<ffffffff8131ecab>] [<ffffffff8131ecab>] memcpy+0xb/0x120
Call Trace:
kcryptd_io_read+0xdb/0x100
crypt_map+0xfd/0x190
__map_bio+0x48/0x150
__split_and_process_bio+0x51b/0x630
dm_request+0x138/0x230
generic_make_request+0xca/0x100
submit_bio+0x87/0x110
sync_request+0xdd/0x120 [logfs]
bdev_readpage+0x2e/0x70 [logfs]
do_read_cache_page+0x82/0x180
logfs_mount+0x2ad/0x770 [logfs]
mount_fs+0x47/0x1c0
vfs_kern_mount+0x72/0x110
do_kern_mount+0x54/0x110
do_mount+0x520/0x7f0
sys_mount+0x90/0xe0
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=42292
Reported-by: Witold Baryluk <baryluk@smp.if.uj.edu.pl>
Signed-off-by: Prasad Joshi <prasadjoshi.linux@gmail.com>
Diffstat (limited to 'fs/logfs')
| -rw-r--r-- | fs/logfs/dev_bdev.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/logfs/dev_bdev.c b/fs/logfs/dev_bdev.c index df0de27c2733..ea29df36893d 100644 --- a/fs/logfs/dev_bdev.c +++ b/fs/logfs/dev_bdev.c @@ -26,6 +26,7 @@ static int sync_request(struct page *page, struct block_device *bdev, int rw) struct completion complete; bio_init(&bio); + bio.bi_max_vecs = 1; bio.bi_io_vec = &bio_vec; bio_vec.bv_page = page; bio_vec.bv_len = PAGE_SIZE; |