From: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
[ Upstream commit 4e240d1bab1ead280ddf5eb05058dba6bbd57d10 ]
If namelen is corrupted to have very long value, fill_dentries can copy
wrong memory area.
Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/f2fs/dir.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 4abefd841b6c7..7a177b8f227d2 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -817,6 +817,16 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
de_name.name = d->filename[bit_pos];
de_name.len = le16_to_cpu(de->name_len);
+ /* check memory boundary before moving forward */
+ bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
+ if (unlikely(bit_pos > d->max)) {
+ f2fs_msg(F2FS_I_SB(d->inode)->sb, KERN_WARNING,
+ "%s: corrupted namelen=%d, run fsck to fix.",
+ __func__, le16_to_cpu(de->name_len));
+ set_sbi_flag(F2FS_I_SB(d->inode)->sb->s_fs_info, SBI_NEED_FSCK);
+ return -EINVAL;
+ }
+
if (f2fs_encrypted_inode(d->inode)) {
int save_len = fstr->len;
int err;
@@ -835,7 +845,6 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
le32_to_cpu(de->ino), d_type))
return 1;
- bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
ctx->pos = start_pos + bit_pos;
}
return 0;
--
2.25.1
