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authorRyusuke Konishi <konishi.ryusuke@gmail.com>2024-03-13 19:58:27 +0900
committerAndrew Morton <akpm@linux-foundation.org>2024-03-14 09:17:30 -0700
commit269cdf353b5bdd15f1a079671b0f889113865f20 (patch)
tree51ad72f8ec1026df89d6d2889da6b51ff1935303 /security
parentf2f26b4a84a0ef41791bd2d70861c8eac748f4ba (diff)
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 'security')
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