On 2022/10/25 1:30, Pavel Machek wrote:
Hi!
From: Chao Yu <chao@xxxxxxxxxx>
commit c6ad7fd16657ebd34a87a97d9588195aae87597d upstream.
As Wenqing Liu reported in bugzilla:
https://bugzilla.kernel.org/show_bug.cgi?id=216456
BUG: KASAN: use-after-free in recover_data+0x63ae/0x6ae0 [f2fs]
Read of size 4 at addr ffff8881464dcd80 by task mount/1013
I believe this is missing put_page on the error path:
+++ b/fs/f2fs/gc.c
@@ -1003,6 +1003,14 @@ static bool is_alive(struct f2fs_sb_info
return false;
}
+ max_addrs = IS_INODE(node_page) ? DEF_ADDRS_PER_INODE :
+ DEF_ADDRS_PER_BLOCK;
+ if (ofs_in_node >= max_addrs) {
+ f2fs_err(sbi, "Inconsistent ofs_in_node:%u in summary, ino:%u, nid:%u, max:%u",
+ ofs_in_node, dni->ino, dni->nid, max_addrs);
+ return false;
+ }
+
*nofs = ofs_of_node(node_page);
source_blkaddr = data_blkaddr(NULL, node_page, ofs_in_node);
f2fs_put_page(node_page, 1);
So something like this is needed. (Feel free to test/adapt/apply).
Signed-off-by: Pavel Machek <pavel@xxxxxxx>
Best regards,
Pavel
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 4546e01b2ee0..dab794225cce 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -1110,6 +1110,7 @@ static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
if (ofs_in_node >= max_addrs) {
f2fs_err(sbi, "Inconsistent ofs_in_node:%u in summary, ino:%u, nid:%u, max:%u",
ofs_in_node, dni->ino, dni->nid, max_addrs);
+ f2fs_put_page(node_page, 1);
return false;
}
My bad, thanks for fixing this.
Reviewed-by: Chao Yu <chao@xxxxxxxxxx>
Thanks,
