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block: bvec_nr_vecs() returns value for wrong slab 

[ Upstream commit d6c02a9beb ]

In commit ed996a52c8 ("block: simplify and cleanup bvec pool
handling"), the value of the slab index is incremented by one in
bvec_alloc() after the allocation is done to indicate an index value of
0 does not need to be later freed.

bvec_nr_vecs() was not updated accordingly, and thus returns the wrong
value.  Decrement idx before performing the lookup.

Fixes: ed996a52c8 ("block: simplify and cleanup bvec pool handling")
Signed-off-by: Greg Edwards <gedwards@ddn.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Greg Edwards 2018-08-08 13:27:53 -06:00 committed by Greg Kroah-Hartman
parent 6952b4ed9e
commit d67c7c9dd1
1 changed files with 1 additions and 1 deletions
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block/bio.c
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@ -156,7 +156,7 @@ out:
unsigned int bvec_nr_vecs(unsigned short idx)
{
return bvec_slabs[idx].nr_vecs;
return bvec_slabs[--idx].nr_vecs;
}
void bvec_free(mempool_t *pool, struct bio_vec *bv, unsigned int idx)