Messages in this thread Patch in this message | | | From | Wen Yang <> | Subject | [PATCH 3/7] drm/msm: a5xx: fix possible object reference leak | Date | Thu, 4 Apr 2019 00:04:11 +0800 |
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The call to of_get_child_by_name returns a node pointer with refcount incremented thus it must be explicitly decremented after the last usage.
Detected by coccinelle with the following warnings: drivers/gpu/drm/msm/adreno/a5xx_gpu.c:57:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 47, but without a corresponding object release within this function. drivers/gpu/drm/msm/adreno/a5xx_gpu.c:66:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 47, but without a corresponding object release within this function. drivers/gpu/drm/msm/adreno/a5xx_gpu.c:118:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 47, but without a corresponding object release within this function. drivers/gpu/drm/msm/adreno/a5xx_gpu.c:57:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 51, but without a corresponding object release within this function. drivers/gpu/drm/msm/adreno/a5xx_gpu.c:66:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 51, but without a corresponding object release within this function. drivers/gpu/drm/msm/adreno/a5xx_gpu.c:118:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 51, but without a corresponding object release within this function.
Signed-off-by: Wen Yang <wen.yang99@zte.com.cn> Cc: Rob Clark <robdclark@gmail.com> Cc: Sean Paul <sean@poorly.run> Cc: David Airlie <airlied@linux.ie> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Jordan Crouse <jcrouse@codeaurora.org> Cc: Mamta Shukla <mamtashukla555@gmail.com> Cc: Thomas Zimmermann <tzimmermann@suse.de> Cc: Sharat Masetty <smasetty@codeaurora.org> Cc: linux-arm-msm@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: freedreno@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org (open list) --- drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c index d5f5e56..270da14 100644 --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c @@ -34,7 +34,7 @@ static int zap_shader_load_mdt(struct msm_gpu *gpu, const char *fwname) { struct device *dev = &gpu->pdev->dev; const struct firmware *fw; - struct device_node *np; + struct device_node *np, *mem_np; struct resource r; phys_addr_t mem_phys; ssize_t mem_size; @@ -48,11 +48,13 @@ static int zap_shader_load_mdt(struct msm_gpu *gpu, const char *fwname) if (!np) return -ENODEV; - np = of_parse_phandle(np, "memory-region", 0); - if (!np) + mem_np = of_parse_phandle(np, "memory-region", 0); + of_node_put(np); + if (!mem_np) return -EINVAL; - ret = of_address_to_resource(np, 0, &r); + ret = of_address_to_resource(mem_np, 0, &r); + of_node_put(mem_np); if (ret) return ret; -- 2.9.5
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