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Sun, 14 Dec 2025 11:21:15 -0800 (PST) From: Prithvi Tambewagh To: syzbot+c818e5c4559444f88aa0@syzkaller.appspotmail.com, jlbec@evilplan.org, joseph.qi@linux.alibaba.com, mark@fasheh.com, heming.zhao@suse.com Cc: linux-kernel@vger.kernel.org, ocfs2-devel@lists.linux.dev, syzkaller-bugs@googlegroups.com, Prithvi Tambewagh Subject: Syzbot test for v3: ocfs2: fix kernel BUG in ocfs2_write_block Date: Mon, 15 Dec 2025 00:50:28 +0530 Message-ID: <20251214192047.34811-1-activprithvi@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <66eb6a0e.050a0220.115905.001b.GAE@google.com> References: <66eb6a0e.050a0220.115905.001b.GAE@google.com> Precedence: bulk X-Mailing-List: ocfs2-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit #syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 24172e0d79900908cf5ebf366600616d29c9b417 Signed-off-by: Prithvi Tambewagh --- fs/ocfs2/slot_map.c | 29 +++++++++++++++++++++++++++-- 1 file changed, 27 insertions(+), 2 deletions(-) diff --git a/fs/ocfs2/slot_map.c b/fs/ocfs2/slot_map.c index e544c704b583..40e5e95fd375 100644 --- a/fs/ocfs2/slot_map.c +++ b/fs/ocfs2/slot_map.c @@ -44,6 +44,9 @@ struct ocfs2_slot_info { static int __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si, unsigned int node_num); +static int ocfs2_validate_slot_map_block(struct super_block *sb, + struct buffer_head *bh) + static void ocfs2_invalidate_slot(struct ocfs2_slot_info *si, int slot_num) { @@ -132,7 +135,8 @@ int ocfs2_refresh_slot_info(struct ocfs2_super *osb) * this is not true, the read of -1 (UINT64_MAX) will fail. */ ret = ocfs2_read_blocks(INODE_CACHE(si->si_inode), -1, si->si_blocks, - si->si_bh, OCFS2_BH_IGNORE_CACHE, NULL); + si->si_bh, OCFS2_BH_IGNORE_CACHE, + ocfs2_validate_slot_map_block); if (ret == 0) { spin_lock(&osb->osb_lock); ocfs2_update_slot_info(si); @@ -332,6 +336,26 @@ int ocfs2_clear_slot(struct ocfs2_super *osb, int slot_num) return ocfs2_update_disk_slot(osb, osb->slot_info, slot_num); } +static int ocfs2_validate_slot_map_block(struct super_block *sb, + struct buffer_head *bh) +{ + int rc; + + BUG_ON(!buffer_uptodate(bh)); + + if (bh->b_blocknr < OCFS2_SUPER_BLOCK_BLKNO) { + rc = ocfs2_error(sb, + "Invalid Slot Map Buffer Head " + "Block Number : %llu, Should be >= %d", + (unsigned long long)bh->b_blocknr, + OCFS2_SUPER_BLOCK_BLKNO); + if (!rc) + return -EIO; + return rc; + } + return 0; +} + static int ocfs2_map_slot_buffers(struct ocfs2_super *osb, struct ocfs2_slot_info *si) { @@ -383,7 +407,8 @@ static int ocfs2_map_slot_buffers(struct ocfs2_super *osb, bh = NULL; /* Acquire a fresh bh */ status = ocfs2_read_blocks(INODE_CACHE(si->si_inode), blkno, - 1, &bh, OCFS2_BH_IGNORE_CACHE, NULL); + 1, &bh, OCFS2_BH_IGNORE_CACHE, + ocfs2_validate_slot_map_block); if (status < 0) { mlog_errno(status); goto bail; base-commit: 24172e0d79900908cf5ebf366600616d29c9b417 -- 2.43.0