[PATCH] drm/amd/display: fix memory leaks on error exit return

[Colin King]

From: Colin Ian King <colin.k...@canonical.com>

Currently in the case where some of the allocations fail for dce110_tgv,
dce110_xfmv, dce110_miv or dce110_oppv then the exit return path ends
up leaking allocated objects. Fix this by kfree'ing them before returning.
Also re-work the comparison of the null pointers to use the !ptr idiom.

Detected by CoverityScan, CID#1460246, 1460325, 1460324, 1460392
("Resource Leak")

Fixes: c4562236b3bc ("drm/amd/dc: Add dc display driver (v2)")
Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
 drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c 
b/drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c
index db96d2b47ff1..61adb8174ce0 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c
@@ -1037,11 +1037,13 @@ static bool underlay_create(struct dc_context *ctx, 
struct resource_pool *pool)
        struct dce110_opp *dce110_oppv = kzalloc(sizeof(*dce110_oppv),
                                                 GFP_KERNEL);
 
-       if ((dce110_tgv == NULL) ||
-               (dce110_xfmv == NULL) ||
-               (dce110_miv == NULL) ||
-               (dce110_oppv == NULL))
-                       return false;
+       if (!dce110_tgv || !dce110_xfmv || !dce110_miv || !dce110_oppv) {
+               kfree(dce110_tgv);
+               kfree(dce110_xfmv);
+               kfree(dce110_miv);
+               kfree(dce110_oppv);
+               return false;
+       }
 
        dce110_opp_v_construct(dce110_oppv, ctx);
 
-- 
2.14.1