From: Chao Yu chao@kernel.org
[ Upstream commit 92c556ed6318e13c16746495a8d4513129eb9b0f ]
As Roman Smirnov reported as below:
" There is a possible bug in f2fs_truncate_inode_blocks():
if (err < 0 && err != -ENOENT) goto fail; ... offset[1] = 0; offset[0]++; nofs += err;
If err = -ENOENT then nofs will sum with an error code, which is strange behaviour. Also if nofs < ENOENT this will cause an overflow. err will be equal to -ENOENT with the following call stack:
truncate_nodes() f2fs_get_node_page() __get_node_page() read_node_page() "
If nat is corrupted, truncate_nodes() may return -ENOENT, and f2fs_truncate_inode_blocks() doesn't handle such error correctly, fix it.
Reported-by: Roman Smirnov r.smirnov@omp.ru Closes: https://lore.kernel.org/linux-f2fs-devel/085b27fd2b364a3c8c3a9ca77363e246@om... Signed-off-by: Chao Yu chao@kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/f2fs/node.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index b3de6d6cdb021..bb57bbaff7b4f 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -1187,7 +1187,17 @@ int f2fs_truncate_inode_blocks(struct inode *inode, pgoff_t from) default: BUG(); } - if (err < 0 && err != -ENOENT) + if (err == -ENOENT) { + set_sbi_flag(F2FS_P_SB(page), SBI_NEED_FSCK); + f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR); + f2fs_err_ratelimited(sbi, + "truncate node fail, ino:%lu, nid:%u, " + "offset[0]:%d, offset[1]:%d, nofs:%d", + inode->i_ino, dn.nid, offset[0], + offset[1], nofs); + err = 0; + } + if (err < 0) goto fail; if (offset[1] == 0 && ri->i_nid[offset[0] - NODE_DIR1_BLOCK]) {