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commite106e269c5upstream. 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:1b17a46c92("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.com Signed-off-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>