From: Christoph Hellwig <hch@lst.de>
Date: Mon, 11 May 2026 07:16:52 +0000 (+0200)
Subject: isofs: handle set_blocksize failures
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=25ef4c4d9f0e96fb89c0ae0d7127c3f12a31bc32;p=thirdparty%2Fkernel%2Flinux.git

isofs: handle set_blocksize failures

isofs uses buffer_heads, which don't handle block size > PAGE_SIZE well.
Without this, mounting we will hit the

        BUG_ON(offset >= folio_size(folio));

in folio_set_bh on the first __bread_gfp call.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260511071701.2456211-8-hch@lst.de
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
---

diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index efee53717f1cd..337836a0a1704 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -818,7 +818,8 @@ root_found:
 	 * entries.  By forcing the blocksize in this way, we ensure
 	 * that we will never be required to do this.
 	 */
-	sb_set_blocksize(s, orig_zonesize);
+	if (!sb_set_blocksize(s, orig_zonesize))
+		goto out_freesbi;
 
 	sbi->s_nls_iocharset = NULL;