From: Tim Gardner <tim.gardner@canonical.com>
To: dri-devel@lists.freedesktop.org
Cc: tim.gardner@canonical.com, Rob Clark <robdclark@gmail.com>,
Sean Paul <sean@poorly.run>, David Airlie <airlied@linux.ie>,
Daniel Vetter <daniel@ffwll.ch>,
linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org,
linux-kernel@vger.kernel.org
Subject: [PATCH] drm/msm: prevent NULL dereference in msm_gpu_crashstate_capture()
Date: Wed, 29 Sep 2021 10:25:54 -0600 [thread overview]
Message-ID: <20210929162554.14295-1-tim.gardner@canonical.com> (raw)
Coverity complains of a possible NULL dereference:
CID 120718 (#1 of 1): Dereference null return value (NULL_RETURNS)
23. dereference: Dereferencing a pointer that might be NULL state->bos when
calling msm_gpu_crashstate_get_bo. [show details]
301 msm_gpu_crashstate_get_bo(state, submit->bos[i].obj,
302 submit->bos[i].iova, submit->bos[i].flags);
Fix this by employing the same state->bos NULL check as is used in the next
for loop.
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: linux-arm-msm@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: freedreno@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
---
drivers/gpu/drm/msm/msm_gpu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 8a3a592da3a4..2c46cd968ac4 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -296,7 +296,7 @@ static void msm_gpu_crashstate_capture(struct msm_gpu *gpu,
state->bos = kcalloc(nr,
sizeof(struct msm_gpu_state_bo), GFP_KERNEL);
- for (i = 0; i < submit->nr_bos; i++) {
+ for (i = 0; state->bos && i < submit->nr_bos; i++) {
if (should_dump(submit, i)) {
msm_gpu_crashstate_get_bo(state, submit->bos[i].obj,
submit->bos[i].iova, submit->bos[i].flags);
--
2.33.0
next reply other threads:[~2021-09-29 16:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-29 16:25 Tim Gardner [this message]
2021-10-01 22:42 ` [PATCH] drm/msm: prevent NULL dereference in msm_gpu_crashstate_capture() Dmitry Baryshkov
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