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[176.32.72.196]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2bd5cfe47bdsm30751165ad.44.2026.05.14.09.07.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 May 2026 09:07:23 -0700 (PDT) From: Daiki Harada To: jfs-discussion@lists.sourceforge.net, linux-kernel@vger.kernel.org Cc: Dave Kleikamp , Christian Brauner , Al Viro , Kees Cook , Daiki Harada , syzbot+32ec8b5bd050c78741c2@syzkaller.appspotmail.com Subject: [PATCH] jfs: check sb_set_blocksize() return value in jfs_fill_super() Date: Thu, 14 May 2026 16:07:00 +0000 Message-ID: <20260514160700.376172-1-daiky0325@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit jfs_fill_super() does not check the return value of sb_set_blocksize(). If the block device's logical block size exceeds PAGE_SIZE, sb_set_blocksize() fails and returns 0, but jfs_fill_super() continues regardless. Subsequent sb_bread() calls then trigger a BUG() in folio_alloc_buffers() because the block size is incompatible with the folio size. Fix by checking the return value of sb_set_blocksize() and failing the mount with -EINVAL if it returns 0. Reported-by: syzbot+32ec8b5bd050c78741c2@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=32ec8b5bd050c78741c2 Signed-off-by: Daiki Harada diff --git a/fs/jfs/super.c b/fs/jfs/super.c index 61575f7397ae..c69fc7677a66 100644 --- a/fs/jfs/super.c +++ b/fs/jfs/super.c @@ -491,8 +491,12 @@ static int jfs_fill_super(struct super_block *sb, struct fs_context *fc) /* * Initialize blocksize to 4K. */ - sb_set_blocksize(sb, PSIZE); - + if (!sb_set_blocksize(sb, PSIZE)) { + jfs_err("block size %lu > page size %lu not supported", + sb->s_blocksize, PAGE_SIZE); + ret = -EINVAL; + goto out_unload; + } /* * Set method vectors. */ ---