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btrfs: check block group lookup in remove_range_from_remap_tree()

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Add a check in remove_range_from_remap_tree() after we call
btrfs_lookup_block_group(), to check if it is NULL. This shouldn't
happen, but if it does we at least get an error rather than a segfault.

Reported-by: Chris Mason <clm@fb.com>
Link: https://lore.kernel.org/linux-btrfs/20260125125129.2245240-1-clm@meta.com/
Fixes: 979e1dc3d6 ("btrfs: handle deletions from remapped block group")
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Mark Harmstone <mark@harmstone.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Mark Harmstone 2026-02-19 14:30:59 +00:00 • committed by David Sterba
parent 7885ca40c3
commit f8db8009ea
1 changed files with 3 additions and 0 deletions
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3
fs/btrfs/relocation.c
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@ -5985,6 +5985,9 @@ static int remove_range_from_remap_tree(struct btrfs_trans_handle *trans,
struct btrfs_block_group *dest_bg;
dest_bg = btrfs_lookup_block_group(fs_info, new_addr);
if (unlikely(!dest_bg))
return -EUCLEAN;
adjust_block_group_remap_bytes(trans, dest_bg, -overlap_length);
btrfs_put_block_group(dest_bg);
ret = btrfs_add_to_free_space_tree(trans,