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| author | Ryusuke Konishi <konishi.ryusuke@gmail.com> | 2024-03-13 19:58:27 +0900 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-03-14 09:17:30 -0700 |
| commit | 269cdf353b5bdd15f1a079671b0f889113865f20 (patch) | |
| tree | 51ad72f8ec1026df89d6d2889da6b51ff1935303 /Makefile | |
| parent | f2f26b4a84a0ef41791bd2d70861c8eac748f4ba (diff) | |
| download | lwn-269cdf353b5bdd15f1a079671b0f889113865f20.tar.gz lwn-269cdf353b5bdd15f1a079671b0f889113865f20.zip | |
nilfs2: prevent kernel bug at submit_bh_wbc()
Fix a bug where nilfs_get_block() returns a successful status when
searching and inserting the specified block both fail inconsistently. If
this inconsistent behavior is not due to a previously fixed bug, then an
unexpected race is occurring, so return a temporary error -EAGAIN instead.
This prevents callers such as __block_write_begin_int() from requesting a
read into a buffer that is not mapped, which would cause the BUG_ON check
for the BH_Mapped flag in submit_bh_wbc() to fail.
Link: https://lkml.kernel.org/r/20240313105827.5296-3-konishi.ryusuke@gmail.com
Fixes: 1f5abe7e7dbc ("nilfs2: replace BUG_ON and BUG calls triggerable from ioctl")
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'Makefile')
0 files changed, 0 insertions, 0 deletions