6.12-stable review patch. If anyone has any objections, please let me know.

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From: Yongpeng Yang yangyongpeng@xiaomi.com

commit f2c1f631630e01821fe4c3fdf6077bc7a8284f82 upstream.

sb_min_blocksize() may return 0. Check its return value to avoid accessing the filesystem super block when sb->s_blocksize is 0.

Cc: stable@vger.kernel.org # v6.15 Fixes: 719c1e1829166d ("exfat: add super block operations") Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Yongpeng Yang yangyongpeng@xiaomi.com Link: https://patch.msgid.link/20251104125009.2111925-3-yangyongpeng.storage@gmail... Signed-off-by: Christian Brauner brauner@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/exfat/super.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/exfat/super.c +++ b/fs/exfat/super.c @@ -452,7 +452,10 @@ static int exfat_read_boot_sector(struct struct exfat_sb_info *sbi = EXFAT_SB(sb);

/* set block size to read super block */ - sb_min_blocksize(sb, 512); + if (!sb_min_blocksize(sb, 512)) { + exfat_err(sb, "unable to set blocksize"); + return -EINVAL; + }

/* read boot sector */ sbi->boot_bh = sb_bread(sb, 0);