xen/pvcalls: free active map buffer on pvcalls_front_free_map

[ Upstream commit f57034cedeb6e00256313a2a6ee67f974d709b0b ]

Data buffer for active map is allocated in alloc_active_ring and freed
in free_active_ring function, which is used only for the error
cleanup. pvcalls_front_release is calling pvcalls_front_free_map which
ends foreign access for this buffer, but doesn't free allocated pages.
Call free_active_ring to clean all allocated resources.

Signed-off-by: Oleksii Moisieiev <oleksii_moisieiev@epam.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Link: https://lore.kernel.org/r/6a762ee32dd655cbb09a4aa0e2307e8919761311.1671531297.git.oleksii_moisieiev@epam.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
index 1826e8e..9b56927 100644 (file)
--- a/drivers/xen/pvcalls-front.c
+++ b/drivers/xen/pvcalls-front.c
@@ -225,6 +225,8 @@ again:
        return IRQ_HANDLED;
 }
 
+static void free_active_ring(struct sock_mapping *map);
+
 static void pvcalls_front_free_map(struct pvcalls_bedata *bedata,
                                   struct sock_mapping *map)
 {
@@ -240,7 +242,7 @@ static void pvcalls_front_free_map(struct pvcalls_bedata *bedata,
        for (i = 0; i < (1 << PVCALLS_RING_ORDER); i++)
                gnttab_end_foreign_access(map->active.ring->ref[i], NULL);
        gnttab_end_foreign_access(map->active.ref, NULL);
-       free_page((unsigned long)map->active.ring);
+       free_active_ring(map);
 
        kfree(map);
 }