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dm: cope with access beyond end of device in dm_merge_bvec

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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>
This commit is contained in:
Mikulas Patocka 2008-10-01 14:39:24 +01:00 committed by Alasdair G Kergon
parent 5037108acd
commit b01cd5ac43
1 changed files with 3 additions and 0 deletions
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3
drivers/md/dm.c
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@ -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: