[AGPGART] Prevent (unlikely) memory leak in amd_create_gatt_pages()

If we fail an alloc, unwind the previous allocs that succeeded.

Spotted-by: Alan Grimes <agrimes@speakeasy.net>
Signed-off-by: Dave Jones <davej@redhat.com>

diff --git a/drivers/char/agp/amd-k7-agp.c b/drivers/char/agp/amd-k7-agp.c
index 51d0d562d01e11bc8e457ac4a02dfbf331c2b464..c85c8cadb6dfd67b9531eb849f140e9095deec9a 100644 (file)
--- a/drivers/char/agp/amd-k7-agp.c
+++ b/drivers/char/agp/amd-k7-agp.c
@@ -101,6 +101,11 @@ static int amd_create_gatt_pages(int nr_tables)
        for (i = 0; i < nr_tables; i++) {
                entry = kzalloc(sizeof(struct amd_page_map), GFP_KERNEL);
                if (entry == NULL) {
+                       while (i > 0) {
+                               kfree(tables[i-1]);
+                               i--;
+                       }
+                       kfree(tables);
                        retval = -ENOMEM;
                        break;
                }