The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.
Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 50ac3ecd8e05b6bcc350c71a4307d40c030ec7e4 Mon Sep 17 00:00:00 2001 From: Chao Yu <[email protected]> Date: Mon, 12 Jan 2026 15:49:16 +0800 Subject: [PATCH] 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: [email protected] Reported-by: [email protected] Closes: https://syzkaller.appspot.com/bug?extid=803dd716c4310d16ff3a Signed-off-by: Chao Yu <[email protected]> Signed-off-by: Jaegeuk Kim <[email protected]> --- fs/f2fs/data.c | 12 ++++++++++-- fs/f2fs/f2fs.h | 11 +++++++++++ fs/f2fs/node.c | 20 +++++++++++--------- fs/f2fs/node.h | 8 -------- 4 files changed, 32 insertions(+), 19 deletions(-) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index f461f1318b4cc..9b70b6d337031 100644 --- a/fs/f2fs/data.c +++ b/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); diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index ae78b8e1ca0ce..d41210a381cdb 100644 --- a/fs/f2fs/f2fs.h +++ b/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); diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 30e26b878af0b..efd4f176a1f44 100644 --- a/fs/f2fs/node.c +++ b/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; } diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h index 9cb8dcf8d4176..824ac9f0e6e42 100644 --- a/fs/f2fs/node.h +++ b/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 */ -- 2.51.0 _______________________________________________ Linux-f2fs-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
