[tip:x86/urgent] x86/intel_rdt: Fix memory leak on mount failure

[tip-bot for Vikas Shivappa]

Commit-ID:  79298acc4ba097e9ab78644e3e38902d73547c92
Gitweb:     http://git.kernel.org/tip/79298acc4ba097e9ab78644e3e38902d73547c92
Author:     Vikas Shivappa <vikas.shivappa@xxxxxxxxxxxxxxx>
AuthorDate: Mon, 26 Jun 2017 11:55:49 -0700
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 30 Jun 2017 21:20:00 +0200

x86/intel_rdt: Fix memory leak on mount failure

If mount fails, the kn_info directory is not freed causing memory leak.

Add the missing error handling path.

Fixes: 4e978d06dedb ("x86/intel_rdt: Add "info" files to resctrl file system")
Signed-off-by: Vikas Shivappa <vikas.shivappa@xxxxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: ravi.v.shankar@xxxxxxxxx
Cc: tony.luck@xxxxxxxxx
Cc: fenghua.yu@xxxxxxxxx
Cc: peterz@xxxxxxxxxxxxx
Cc: vikas.shivappa@xxxxxxxxx
Cc: andi.kleen@xxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1498503368-20173-3-git-send-email-vikas.shivappa@xxxxxxxxxxxxxxx

---
 arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index f5af0cc..9257bd9 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -856,11 +856,13 @@ static struct dentry *rdt_mount(struct file_system_type *fs_type,
 	dentry = kernfs_mount(fs_type, flags, rdt_root,
 			      RDTGROUP_SUPER_MAGIC, NULL);
 	if (IS_ERR(dentry))
-		goto out_cdp;
+		goto out_destroy;
 
 	static_branch_enable(&rdt_enable_key);
 	goto out;
 
+out_destroy:
+	kernfs_remove(kn_info);
 out_cdp:
 	cdp_disable();
 out: