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btrfs: don't leak extent_map in btrfs_get_io_geometry() 

btrfs_get_io_geometry() calls btrfs_get_chunk_map() to acquire a reference
on a extent_map, but on normal operation it does not drop this reference
anymore.

This leads to excessive kmemleak reports.

Always call free_extent_map(), not just in the error case.

Fixes: 5f1411265e ("btrfs: Introduce btrfs_io_geometry infrastructure")
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
alistair/sunxi64-5.4-dsi
Johannes Thumshirn 2019-07-15 15:16:12 +02:00 committed by David Sterba
parent bfcea1c661
commit 373c3b80e4
1 changed files with 7 additions and 3 deletions
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10
fs/btrfs/volumes.c
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@ -5941,6 +5941,7 @@ int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
u64 stripe_len;
u64 raid56_full_stripe_start = (u64)-1;
int data_stripes;
int ret = 0;
ASSERT(op != BTRFS_MAP_DISCARD);
@ -5961,8 +5962,8 @@ int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
btrfs_crit(fs_info,
"stripe math has gone wrong, stripe_offset=%llu offset=%llu start=%llu logical=%llu stripe_len=%llu",
stripe_offset, offset, em->start, logical, stripe_len);
free_extent_map(em);
return -EINVAL;
ret = -EINVAL;
goto out;
}
/* stripe_offset is the offset of this block in its stripe */
@ -6009,7 +6010,10 @@ int btrfs_get_io_geometry(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
io_geom->stripe_offset = stripe_offset;
io_geom->raid56_stripe_offset = raid56_full_stripe_start;
return 0;
out:
/* once for us */
free_extent_map(em);
return ret;
}
static int __btrfs_map_block(struct btrfs_fs_info *fs_info,