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| author | Mikulas Patocka <mpatocka@redhat.com> | 2008-10-01 15:39:24 +0200 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2008-10-01 15:39:24 +0200 |
| commit | b01cd5ac43b00c49759c126c21e7d22c7e80b245 (patch) | |
| tree | ccfda9067457032999a5d2d6ed5203caa2422937 /drivers/md/dm.c | |
| parent | dm: always allow one page in dm_merge_bvec (diff) | |
| download | linux-b01cd5ac43b00c49759c126c21e7d22c7e80b245.tar.xz linux-b01cd5ac43b00c49759c126c21e7d22c7e80b245.zip | |
dm: cope with access beyond end of device in dm_merge_bvec
If for any reason dm_merge_bvec() is given an offset beyond the end of the
device, avoid an oops and always allow one page to be added to an empty bio.
We'll reject the I/O later after the bio is submitted.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm.c')
| -rw-r--r-- | drivers/md/dm.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 469cec54f371..ace998ce59f6 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -843,6 +843,8 @@ static int dm_merge_bvec(struct request_queue *q, goto out; ti = dm_table_find_target(map, bvm->bi_sector); + if (!dm_target_is_valid(ti)) + goto out_table; /* * Find maximum amount of I/O that won't need splitting @@ -861,6 +863,7 @@ static int dm_merge_bvec(struct request_queue *q, if (max_size && ti->type->merge) max_size = ti->type->merge(ti, bvm, biovec, max_size); +out_table: dm_table_put(map); out: |