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 e106e269c5cb38315eb0a0e7e38f71e9b20c8c66 upstream.

sb_min_blocksize() may return 0. Check its return value to avoid opt->blocksize and sb->s_blocksize is 0.

Cc: stable@vger.kernel.org # v6.15 Fixes: 1b17a46c9243e9 ("isofs: convert isofs to use the new mount API") Reviewed-by: Jan Kara jack@suse.cz Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Yongpeng Yang yangyongpeng@xiaomi.com Link: https://patch.msgid.link/20251104125009.2111925-4-yangyongpeng.storage@gmail... Signed-off-by: Christian Brauner brauner@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/isofs/inode.c | 5 +++++ 1 file changed, 5 insertions(+)

--- a/fs/isofs/inode.c +++ b/fs/isofs/inode.c @@ -610,6 +610,11 @@ static int isofs_fill_super(struct super goto out_freesbi; } opt->blocksize = sb_min_blocksize(s, opt->blocksize); + if (!opt->blocksize) { + printk(KERN_ERR + "ISOFS: unable to set blocksize\n"); + goto out_freesbi; + }

sbi->s_high_sierra = 0; /* default is iso9660 */ sbi->s_session = opt->session;