+ nilfs2-prevent-kernel-bug-at-submit_bh_wbc.patch added to mm-nonmm-unstable branch

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The patch titled
     Subject: nilfs2: prevent kernel bug at submit_bh_wbc()
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     nilfs2-prevent-kernel-bug-at-submit_bh_wbc.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/nilfs2-prevent-kernel-bug-at-submit_bh_wbc.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Subject: nilfs2: prevent kernel bug at submit_bh_wbc()
Date: Wed, 13 Mar 2024 19:58:27 +0900

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@xxxxxxxxx
Fixes: 1f5abe7e7dbc ("nilfs2: replace BUG_ON and BUG calls triggerable from ioctl")
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 fs/nilfs2/inode.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/nilfs2/inode.c~nilfs2-prevent-kernel-bug-at-submit_bh_wbc
+++ a/fs/nilfs2/inode.c
@@ -112,7 +112,7 @@ int nilfs_get_block(struct inode *inode,
 					   "%s (ino=%lu): a race condition while inserting a data block at offset=%llu",
 					   __func__, inode->i_ino,
 					   (unsigned long long)blkoff);
-				err = 0;
+				err = -EAGAIN;
 			}
 			nilfs_transaction_abort(inode->i_sb);
 			goto out;
_

Patches currently in -mm which might be from konishi.ryusuke@xxxxxxxxx are

nilfs2-fix-failure-to-detect-dat-corruption-in-btree-and-direct-mappings.patch
nilfs2-prevent-kernel-bug-at-submit_bh_wbc.patch





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