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btrfs: handle empty eb->folios in num_extent_folios()

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num_extent_folios() unconditionally calls folio_order() on
eb->folios[0]. If that is NULL this will be a segfault. It is reasonable
for it to return 0 as the number of folios in the eb when the first
entry is NULL, so do that instead.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Boris Burkov <boris@bur.io>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Boris Burkov 2025-04-25 12:47:50 -07:00 • committed by David Sterba
parent bc7e097509
commit d6fe0c69b3
1 changed files with 2 additions and 0 deletions
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2
fs/btrfs/extent_io.h
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@ -298,6 +298,8 @@ static inline int __pure num_extent_pages(const struct extent_buffer *eb)
*/
static inline int __pure num_extent_folios(const struct extent_buffer *eb)
{
if (!eb->folios[0])
return 0;
if (folio_order(eb->folios[0]))
return 1;
return num_extent_pages(eb);