The patch below was submitted to be applied to the 6.15-stable tree.

I fail to see how this patch meets the stable kernel rules as found at Documentation/process/stable-kernel-rules.rst.

I could be totally wrong, and if so, please respond to stable@vger.kernel.org and let me know why this patch should be applied. Otherwise, it is now dropped from my patch queues, never to be seen again.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 8637fa89e678422995301ddb20b74190dffcccee Mon Sep 17 00:00:00 2001 From: Yongpeng Yang yangyongpeng@xiaomi.com Date: Tue, 4 Nov 2025 20:50:10 +0800 Subject: [PATCH] block: add __must_check attribute to sb_min_blocksize() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

When sb_min_blocksize() returns 0 and the return value is not checked, it may lead to a situation where sb->s_blocksize is 0 when accessing the filesystem super block. After commit a64e5a596067bd ("bdev: add back PAGE_SIZE block size validation for sb_set_blocksize()"), this becomes more likely to happen when the block device’s logical_block_size is larger than PAGE_SIZE and the filesystem is unformatted. Add the __must_check attribute to ensure callers always check the return value.

Cc: stable@vger.kernel.org # v6.15 Suggested-by: Matthew Wilcox willy@infradead.org Reviewed-by: Christoph Hellwig hch@lst.de Reviewed-by: Jan Kara jack@suse.cz Signed-off-by: Yongpeng Yang yangyongpeng@xiaomi.com Link: https://patch.msgid.link/20251104125009.2111925-6-yangyongpeng.storage@gmail... Signed-off-by: Christian Brauner brauner@kernel.org

diff --git a/block/bdev.c b/block/bdev.c index 810707cca970..638f0cd458ae 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -231,7 +231,7 @@ int sb_set_blocksize(struct super_block *sb, int size)

EXPORT_SYMBOL(sb_set_blocksize);

-int sb_min_blocksize(struct super_block *sb, int size) +int __must_check sb_min_blocksize(struct super_block *sb, int size) { int minsize = bdev_logical_block_size(sb->s_bdev); if (size < minsize) diff --git a/include/linux/fs.h b/include/linux/fs.h index c895146c1444..3ea98c6cce81 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3423,8 +3423,8 @@ static inline void remove_inode_hash(struct inode *inode) extern void inode_sb_list_add(struct inode *inode); extern void inode_add_lru(struct inode *inode);

-extern int sb_set_blocksize(struct super_block *, int); -extern int sb_min_blocksize(struct super_block *, int); +int sb_set_blocksize(struct super_block *sb, int size); +int __must_check sb_min_blocksize(struct super_block *sb, int size);

int generic_file_mmap(struct file *, struct vm_area_struct *); int generic_file_mmap_prepare(struct vm_area_desc *desc);