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f2fs: add READ_ONCE() for i_blocks in f2fs_update_inode()

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commit 5471834a96 upstream.

f2fs_update_inode() reads inode->i_blocks without holding i_lock to
serialize it to the on-disk inode, while concurrent truncate or
allocation paths may modify i_blocks under i_lock.  Since blkcnt_t is
u64, this risks torn reads on 32-bit architectures.

Following the approach in ext4_inode_blocks_set(), add READ_ONCE() to prevent
potential compiler-induced tearing.

Fixes: 19f99cee20 ("f2fs: add core inode operations")
Cc: stable@vger.kernel.org
Signed-off-by: Cen Zhang <zzzccc427@gmail.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Cen Zhang
2026-05-17 17:13:43 +02:00
committed by Greg Kroah-Hartman
parent ebeb70e29e
commit a2bcf16cdf
1 changed files with 1 additions and 1 deletions
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fs/f2fs/inode.c
+1 -1
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@@ -665,7 +665,7 @@ void f2fs_update_inode(struct inode *inode, struct page *node_page)
ri->i_uid = cpu_to_le32(i_uid_read(inode));
ri->i_gid = cpu_to_le32(i_gid_read(inode));
ri->i_links = cpu_to_le32(inode->i_nlink);
ri->i_blocks = cpu_to_le64(SECTOR_TO_BLOCK(inode->i_blocks) + 1);
ri->i_blocks = cpu_to_le64(SECTOR_TO_BLOCK(READ_ONCE(inode->i_blocks)) + 1);
if (!f2fs_is_atomic_file(inode) ||
is_inode_flag_set(inode, FI_ATOMIC_COMMITTED))