From: Yongpeng Yang Date: Tue, 4 Nov 2025 12:50:07 +0000 (+0800) Subject: exfat: check return value of sb_min_blocksize in exfat_read_boot_sector X-Git-Tag: v6.17.10~157 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6758ef4d18112d723375f9c9a88f04b8cc179ba4;p=thirdparty%2Fkernel%2Fstable.git exfat: check return value of sb_min_blocksize in exfat_read_boot_sector 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 Signed-off-by: Yongpeng Yang Link: https://patch.msgid.link/20251104125009.2111925-3-yangyongpeng.storage@gmail.com Signed-off-by: Christian Brauner Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/exfat/super.c b/fs/exfat/super.c index 8926e63f5bb7e..bd9299e479813 100644 --- a/fs/exfat/super.c +++ b/fs/exfat/super.c @@ -423,7 +423,10 @@ 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);