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| author | youngjun <her0gyugyu@gmail.com> | 2020-06-16 17:30:43 +0900 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2020-07-16 00:05:40 +0200 |
| commit | 24f14009b8f1754ec2ae4c168940c01259b0f88a (patch) | |
| tree | 70602e832a946166458cc7e76131fe077130ce8d | |
| parent | b3a9e3b9622ae10064826dccb4f7a52bd88c7407 (diff) | |
| download | mvebu-24f14009b8f1754ec2ae4c168940c01259b0f88a.tar.gz | |
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>
| -rw-r--r-- | fs/overlayfs/super.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 91476bc422f964..498d49d5dd1924 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]); |