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| author | Ritesh Harjani (IBM) <ritesh.list@gmail.com> | 2024-02-29 11:40:13 +0530 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2024-05-02 10:50:44 -0400 |
| commit | c2a09f3d782de952f09a3962d03b939e7fa7ffa4 (patch) | |
| tree | 721d42055cd75391056f071b77d32e3f58c9bcfe /fs/ext4 | |
| parent | 0bbac3facb5d6cc0171c45c9873a2dc96bea9680 (diff) | |
| download | linux-c2a09f3d782de952f09a3962d03b939e7fa7ffa4.tar.gz linux-c2a09f3d782de952f09a3962d03b939e7fa7ffa4.tar.bz2 linux-c2a09f3d782de952f09a3962d03b939e7fa7ffa4.zip | |
ext4: Fixes len calculation in mpage_journal_page_buffers
Truncate operation can race with writeback, in which inode->i_size can get
truncated and therefore size - folio_pos() can be negative. This fixes the
len calculation. However this path doesn't get easily triggered even
with data journaling.
Cc: stable@kernel.org # v6.5
Fixes: 80be8c5cc925 ("Fixes: ext4: Make mpage_journal_page_buffers use folio")
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/cff4953b5c9306aba71e944ab176a5d396b9a1b7.1709182250.git.ritesh.list@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/inode.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 537803250ca9..bab9223d94ac 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -2334,7 +2334,7 @@ static int mpage_journal_page_buffers(handle_t *handle, if (folio_pos(folio) + len > size && !ext4_verity_in_progress(inode)) - len = size - folio_pos(folio); + len = size & (len - 1); return ext4_journal_folio_buffers(handle, folio, len); } |