From: Christoph Hellwig <hch@lst.de>
Date: Mon, 11 May 2026 07:16:50 +0000 (+0200)
Subject: befs: handle set_blocksize failures
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=7597d42a25332617a3dfe596758d780ec6c028d7;p=thirdparty%2Fkernel%2Flinux.git

befs: handle set_blocksize failures

befs 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/20260511071701.2456211-6-hch@lst.de
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
---

diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
index c12caae9a9679..ee0cbae521b9f 100644
--- a/fs/befs/linuxvfs.c
+++ b/fs/befs/linuxvfs.c
@@ -860,7 +860,8 @@ befs_fill_super(struct super_block *sb, struct fs_context *fc)
 	 */
 	sb->s_magic = BEFS_SUPER_MAGIC;
 	/* Set real blocksize of fs */
-	sb_set_blocksize(sb, (ulong) befs_sb->block_size);
+	if (!sb_set_blocksize(sb, (ulong) befs_sb->block_size))
+		goto unacquire_priv_sbp;
 	sb->s_op = &befs_sops;
 	sb->s_export_op = &befs_export_operations;
 	sb->s_time_min = 0;