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exfat: check return value of sb_min_blocksize in exfat_read_boot_sector

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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: 719c1e1829 ("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.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Yongpeng Yang 2025-11-04 20:50:07 +08:00 committed by Christian Brauner
parent 63b5aa01da
commit f2c1f63163
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1 changed files with 4 additions and 1 deletions
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5
fs/exfat/super.c
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@ -433,7 +433,10 @@ static int exfat_read_boot_sector(struct super_block *sb)
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);