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authorAndreas Gruenbacher <agruenba@redhat.com>2018-11-26 18:45:35 +0100
committerAndreas Gruenbacher <agruenba@redhat.com>2018-12-11 21:44:29 +0100
commit6ff9b09e00a441599f3aacdf577254455a048bc9 (patch)
treeae5ebad26e35f1445b1295b224d962831124769a /fs/gfs2
parentcbbe76c8bb27c0bea4bfa6cac56b5d4073b90687 (diff)
gfs2: Get rid of potential double-freeing in gfs2_create_inode
In gfs2_create_inode, after setting and releasing the acl / default_acl, the acl / default_acl pointers are not set to NULL as they should be. In that state, when the function reaches label fail_free_acls, gfs2_create_inode will try to release the same acls again. Fix that by setting the pointers to NULL after releasing the acls. Slightly simplify the logic. Also, posix_acl_release checks for NULL already, so there is no need to duplicate those checks here. Fixes: e01580bf9e4d ("gfs2: use generic posix ACL infrastructure") Reported-by: Pan Bian <bianpan2016@163.com> Cc: Christoph Hellwig <hch@lst.de> Cc: stable@vger.kernel.org # v4.9+ Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Diffstat (limited to 'fs/gfs2')
-rw-r--r--fs/gfs2/inode.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 648f0ca1ad57..998051c4aea7 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -744,17 +744,19 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
the gfs2 structures. */
if (default_acl) {
error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
+ if (error)
+ goto fail_gunlock3;
posix_acl_release(default_acl);
+ default_acl = NULL;
}
if (acl) {
- if (!error)
- error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
+ error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
+ if (error)
+ goto fail_gunlock3;
posix_acl_release(acl);
+ acl = NULL;
}
- if (error)
- goto fail_gunlock3;
-
error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
&gfs2_initxattrs, NULL);
if (error)
@@ -789,10 +791,8 @@ fail_free_inode:
}
gfs2_rsqa_delete(ip, NULL);
fail_free_acls:
- if (default_acl)
- posix_acl_release(default_acl);
- if (acl)
- posix_acl_release(acl);
+ posix_acl_release(default_acl);
+ posix_acl_release(acl);
fail_gunlock:
gfs2_dir_no_add(&da);
gfs2_glock_dq_uninit(ghs);