f2fs: fix to do sanity check on node footer in {read,write}_end_io

-----------[ cut here ]------------
kernel BUG at fs/f2fs/data.c:358!
Call Trace:
 <IRQ>
 blk_update_request+0x5eb/0xe70 block/blk-mq.c:987
 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1149
 blk_complete_reqs block/blk-mq.c:1224 [inline]
 blk_done_softirq+0x107/0x160 block/blk-mq.c:1229
 handle_softirqs+0x283/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>

In f2fs_write_end_io(), it detects there is inconsistency in between
node page index (nid) and footer.nid of node page.

If footer of node page is corrupted in fuzzed image, then we load corrupted
node page w/ async method, e.g. f2fs_ra_node_pages() or f2fs_ra_node_page(),
in where we won't do sanity check on node footer, once node page becomes
dirty, we will encounter this bug after node page writeback.

Cc: stable@kernel.org
Reported-by: syzbot+803dd716c4310d16ff3a@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=803dd716c4310d16ff3a
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Author: chaseyu

fs/f2fs/data.c

@@ -172,6 +172,11 @@ static void f2fs_finish_read_bio(struct bio *bio, bool in_task)
 		while (nr_pages--)
 			dec_page_count(F2FS_F_SB(folio), __read_io_type(folio));
 
+		if (F2FS_F_SB(folio)->node_inode && is_node_folio(folio) &&
+			f2fs_sanity_check_node_footer(F2FS_F_SB(folio),
+				folio, folio->index, NODE_TYPE_REGULAR, true))
+			bio->bi_status = BLK_STS_IOERR;
+
 		if (finished)
 			folio_end_read(folio, bio->bi_status == BLK_STS_OK);
 	}
@@ -374,8 +379,11 @@ static void f2fs_write_end_io(struct bio *bio)
 						STOP_CP_REASON_WRITE_FAIL);
 		}
 
-		f2fs_bug_on(sbi, is_node_folio(folio) &&
-				folio->index != nid_of_node(folio));
+		if (is_node_folio(folio)) {
+			f2fs_sanity_check_node_footer(sbi, folio,
+				folio->index, NODE_TYPE_REGULAR, true);
+			f2fs_bug_on(sbi, folio->index != nid_of_node(folio));
+		}
 
 		dec_page_count(sbi, type);
 

fs/f2fs/f2fs.h

@@ -1572,6 +1572,14 @@ enum f2fs_lookup_mode {
 	LOOKUP_AUTO,
 };
 
+/* For node type in __get_node_folio() */
+enum node_type {
+	NODE_TYPE_REGULAR,
+	NODE_TYPE_INODE,
+	NODE_TYPE_XATTR,
+	NODE_TYPE_NON_INODE,
+};
+
 /* a threshold of maximum elapsed time in critical region to print tracepoint */
 #define MAX_LOCK_ELAPSED_TIME		500
 
@@ -3915,6 +3923,9 @@ struct folio *f2fs_new_node_folio(struct dnode_of_data *dn, unsigned int ofs);
 void f2fs_ra_node_page(struct f2fs_sb_info *sbi, nid_t nid);
 struct folio *f2fs_get_node_folio(struct f2fs_sb_info *sbi, pgoff_t nid,
 						enum node_type node_type);
+int f2fs_sanity_check_node_footer(struct f2fs_sb_info *sbi,
+					struct folio *folio, pgoff_t nid,
+					enum node_type ntype, bool in_irq);
 struct folio *f2fs_get_inode_folio(struct f2fs_sb_info *sbi, pgoff_t ino);
 struct folio *f2fs_get_xnode_folio(struct f2fs_sb_info *sbi, pgoff_t xnid);
 int f2fs_move_node_folio(struct folio *node_folio, int gc_type);

fs/f2fs/node.c

@@ -1511,9 +1511,9 @@ void f2fs_ra_node_page(struct f2fs_sb_info *sbi, nid_t nid)
 	f2fs_folio_put(afolio, err ? true : false);
 }
 
-static int sanity_check_node_footer(struct f2fs_sb_info *sbi,
+int f2fs_sanity_check_node_footer(struct f2fs_sb_info *sbi,
 					struct folio *folio, pgoff_t nid,
-					enum node_type ntype)
+					enum node_type ntype, bool in_irq)
 {
 	if (unlikely(nid != nid_of_node(folio)))
 		goto out_err;
@@ -1538,12 +1538,13 @@ static int sanity_check_node_footer(struct f2fs_sb_info *sbi,
 		goto out_err;
 	return 0;
 out_err:
-	f2fs_warn(sbi, "inconsistent node block, node_type:%d, nid:%lu, "
-		  "node_footer[nid:%u,ino:%u,ofs:%u,cpver:%llu,blkaddr:%u]",
-		  ntype, nid, nid_of_node(folio), ino_of_node(folio),
-		  ofs_of_node(folio), cpver_of_node(folio),
-		  next_blkaddr_of_node(folio));
 	set_sbi_flag(sbi, SBI_NEED_FSCK);
+	f2fs_warn_ratelimited(sbi, "inconsistent node block, node_type:%d, nid:%lu, "
+		"node_footer[nid:%u,ino:%u,ofs:%u,cpver:%llu,blkaddr:%u]",
+		ntype, nid, nid_of_node(folio), ino_of_node(folio),
+		ofs_of_node(folio), cpver_of_node(folio),
+		next_blkaddr_of_node(folio));
+
 	f2fs_handle_error(sbi, ERROR_INCONSISTENT_FOOTER);
 	return -EFSCORRUPTED;
 }
@@ -1589,7 +1590,7 @@ static struct folio *__get_node_folio(struct f2fs_sb_info *sbi, pgoff_t nid,
 		goto out_err;
 	}
 page_hit:
-	err = sanity_check_node_footer(sbi, folio, nid, ntype);
+	err = f2fs_sanity_check_node_footer(sbi, folio, nid, ntype, false);
 	if (!err)
 		return folio;
 out_err:
@@ -1764,7 +1765,8 @@ static bool __write_node_folio(struct folio *folio, bool atomic, bool *submitted
 	/* get old block addr of this node page */
 	nid = nid_of_node(folio);
 
-	if (sanity_check_node_footer(sbi, folio, nid, NODE_TYPE_REGULAR)) {
+	if (f2fs_sanity_check_node_footer(sbi, folio, nid,
+					NODE_TYPE_REGULAR, false)) {
 		f2fs_handle_critical_error(sbi, STOP_CP_REASON_CORRUPTED_NID);
 		goto redirty_out;
 	}

fs/f2fs/node.h

@@ -52,14 +52,6 @@ enum {
 	IS_PREALLOC,		/* nat entry is preallocated */
 };
 
-/* For node type in __get_node_folio() */
-enum node_type {
-	NODE_TYPE_REGULAR,
-	NODE_TYPE_INODE,
-	NODE_TYPE_XATTR,
-	NODE_TYPE_NON_INODE,
-};
-
 /*
  * For node information
  */