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; } -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
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