gfs2: move privileged user check to gfs2_quota_lock_check

[ Upstream commit 4ed0c30811cb4d30ef89850b787a53a84d5d2bcb ]

Before this patch, function gfs2_quota_lock checked if it was called
from a privileged user, and if so, it bypassed the quota check:
superuser can operate outside the quotas.
That's the wrong place for the check because the lock/unlock functions
are separate from the lock_check function, and you can do lock and
unlock without actually checking the quotas.

This patch moves the check to gfs2_quota_lock_check.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index e700fb16266474e4a39708244ddecb26ebb23367..a833e2e0716754d7df90eba16d4e9f7388c21c1d 100644 (file)
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -1039,8 +1039,7 @@ int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
        u32 x;
        int error = 0;
 
-       if (capable(CAP_SYS_RESOURCE) ||
-           sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
+       if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
                return 0;
 
        error = gfs2_quota_hold(ip, uid, gid);

diff --git a/fs/gfs2/quota.h b/fs/gfs2/quota.h
index 836f29480be6719c61dc2380a42b8556c6c88a99..e3a6e2404d11d231cc726bfcc55fee06dedcfa9b 100644 (file)
--- a/fs/gfs2/quota.h
+++ b/fs/gfs2/quota.h
@@ -47,7 +47,8 @@ static inline int gfs2_quota_lock_check(struct gfs2_inode *ip,
        int ret;
 
        ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
-       if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
+       if (capable(CAP_SYS_RESOURCE) ||
+           sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
                return 0;
        ret = gfs2_quota_lock(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
        if (ret)