linux-kernel - [PATCH v3] media: venus: vdec: fixed possible memory leak issue

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Message-Id: <20211206104315.12516-1-amhamza.mgc@gmail.com>
Date:   Mon,  6 Dec 2021 15:43:15 +0500
From:   Ameer Hamza <amhamza.mgc@...il.com>
To:     kieran.bingham@...asonboard.com
Cc:     agross@...nel.org, bjorn.andersson@...aro.org, mchehab@...nel.org,
        stanimir.varbanov@...aro.org, linux-media@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        amhamza.mgc@...il.com
Subject: [PATCH v3] media: venus: vdec: fixed possible memory leak issue

The venus_helper_alloc_dpb_bufs() implementation allows an early return
on an error path when checking the id from ida_alloc_min() which would
not release the earlier buffer allocation.

Move the direct kfree() from the error checking of dma_alloc_attrs() to
the common fail path to ensure that allocations are released on all
error paths in this function.

Addresses-Coverity: 1494120 ("Resource leak")

Fixes: 40d87aafee29 ("media: venus: vdec: decoded picture buffer handling during reconfig sequence")

Signed-off-by: Ameer Hamza <amhamza.mgc@...il.com>

---
Changes in v3:
Updated description and added fix tag
---
 drivers/media/platform/qcom/venus/helpers.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
index 84c3a511ec31..0bca95d01650 100644
--- a/drivers/media/platform/qcom/venus/helpers.c
+++ b/drivers/media/platform/qcom/venus/helpers.c
@@ -189,7 +189,6 @@ int venus_helper_alloc_dpb_bufs(struct venus_inst *inst)
 		buf->va = dma_alloc_attrs(dev, buf->size, &buf->da, GFP_KERNEL,
 					  buf->attrs);
 		if (!buf->va) {
-			kfree(buf);
 			ret = -ENOMEM;
 			goto fail;
 		}
@@ -209,6 +208,7 @@ int venus_helper_alloc_dpb_bufs(struct venus_inst *inst)
 	return 0;
 
 fail:
+	kfree(buf);
 	venus_helper_free_dpb_bufs(inst);
 	return ret;
 }
-- 
2.25.1