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authorMiklos Szeredi <mszeredi@redhat.com>2017-06-28 13:41:22 +0200
committerMiklos Szeredi <mszeredi@redhat.com>2017-06-28 13:41:22 +0200
commite85f82ff9b8ef503923a3be8ca6b5fd1908a7f3f (patch)
tree7c0b05231e998562d9fe83c41568f8f11ea480a6 /fs/overlayfs
parentc0bc126f97fb929b3ae02c1c62322645d70eb408 (diff)
downloadlinux-e85f82ff9b8ef503923a3be8ca6b5fd1908a7f3f.tar.bz2
ovl: copy-up: don't unlock between lookup and link
Nothing prevents mischief on upper layer while we are busy copying up the data. Move the lookup right before the looked up dentry is actually used. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Fixes: 01ad3eb8a073 ("ovl: concurrent copy up of regular files") Cc: <stable@vger.kernel.org> # v4.11
Diffstat (limited to 'fs/overlayfs')
-rw-r--r--fs/overlayfs/copy_up.c24
1 files changed, 12 insertions, 12 deletions
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 7a44533f4bbf..ded8bfeb193e 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -330,15 +330,9 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
.link = link
};
- upper = lookup_one_len(dentry->d_name.name, upperdir,
- dentry->d_name.len);
- err = PTR_ERR(upper);
- if (IS_ERR(upper))
- goto out;
-
err = security_inode_copy_up(dentry, &new_creds);
if (err < 0)
- goto out1;
+ goto out;
if (new_creds)
old_creds = override_creds(new_creds);
@@ -362,7 +356,7 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
}
if (err)
- goto out2;
+ goto out;
if (S_ISREG(stat->mode)) {
struct path upperpath;
@@ -403,6 +397,14 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
if (err)
goto out_cleanup;
+ upper = lookup_one_len(dentry->d_name.name, upperdir,
+ dentry->d_name.len);
+ if (IS_ERR(upper)) {
+ err = PTR_ERR(upper);
+ upper = NULL;
+ goto out_cleanup;
+ }
+
if (tmpfile)
err = ovl_do_link(temp, udir, upper, true);
else
@@ -416,17 +418,15 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
/* Restore timestamps on parent (best effort) */
ovl_set_timestamps(upperdir, pstat);
-out2:
+out:
dput(temp);
-out1:
dput(upper);
-out:
return err;
out_cleanup:
if (!tmpfile)
ovl_cleanup(wdir, temp);
- goto out2;
+ goto out;
}
/*