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authoryoungjun <her0gyugyu@gmail.com>2020-06-16 17:30:43 +0900
committerMiklos Szeredi <mszeredi@redhat.com>2020-07-16 00:05:40 +0200
commit24f14009b8f1754ec2ae4c168940c01259b0f88a (patch)
tree70602e832a946166458cc7e76131fe077130ce8d /fs/overlayfs
parentb3a9e3b9622ae10064826dccb4f7a52bd88c7407 (diff)
downloadlinux-24f14009b8f1754ec2ae4c168940c01259b0f88a.tar.bz2
ovl: inode reference leak in ovl_is_inuse true case.
When "ovl_is_inuse" true case, trap inode reference not put. plus adding the comment explaining sequence of ovl_is_inuse after ovl_setup_trap. Fixes: 0be0bfd2de9d ("ovl: fix regression caused by overlapping layers detection") Cc: <stable@vger.kernel.org> # v4.19+ Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: youngjun <her0gyugyu@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs')
-rw-r--r--fs/overlayfs/super.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 91476bc422f9..498d49d5dd19 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1493,14 +1493,23 @@ static int ovl_get_layers(struct super_block *sb, struct ovl_fs *ofs,
if (err < 0)
goto out;
+ /*
+ * Check if lower root conflicts with this overlay layers before
+ * checking if it is in-use as upperdir/workdir of "another"
+ * mount, because we do not bother to check in ovl_is_inuse() if
+ * the upperdir/workdir is in fact in-use by our
+ * upperdir/workdir.
+ */
err = ovl_setup_trap(sb, stack[i].dentry, &trap, "lowerdir");
if (err)
goto out;
if (ovl_is_inuse(stack[i].dentry)) {
err = ovl_report_in_use(ofs, "lowerdir");
- if (err)
+ if (err) {
+ iput(trap);
goto out;
+ }
}
mnt = clone_private_mount(&stack[i]);