linux-kernel - [PATCH] drm/msm: fix potential memleak issue

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Message-Id: <20200612050633.3441-1-bernard@vivo.com>
Date:   Fri, 12 Jun 2020 13:06:32 +0800
From:   Bernard Zhao <bernard@...o.com>
To:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com, Bernard Zhao <bernard@...o.com>
Subject: [PATCH] drm/msm: fix potential memleak issue

Function msm_gpu_crashstate_capture maybe called for several
times, and then the state->bos is a potential memleak. Also
the state->pos maybe alloc failed, but now without any handle.
This change is to fix some potential memleak and add error
handle when alloc failed.

Signed-off-by: Bernard Zhao <bernard@...o.com>
---
 drivers/gpu/drm/msm/msm_gpu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index a22d30622306..d67a9933f3ce 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -366,8 +366,11 @@ static void msm_gpu_crashstate_capture(struct msm_gpu *gpu,
 			if (!should_dump(submit, submit->cmd[i].idx))
 				nr++;
 
+		kfree(state->bos);
 		state->bos = kcalloc(nr,
 			sizeof(struct msm_gpu_state_bo), GFP_KERNEL);
+		if (!state->bos)
+			return;
 
 		for (i = 0; i < submit->nr_bos; i++) {
 			if (should_dump(submit, i)) {
-- 
2.17.1