linux-kernel - [PATCH] accel/amdxdna: Fix memory leak in amdxdna_ubuf

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Message-ID: <20260129100731.56116-1-zishun.yi.dev@gmail.com>
Date: Thu, 29 Jan 2026 18:07:31 +0800
From: zishun yi <zishun.yi.dev@...il.com>
To: Min Ma <mamin506@...il.com>,
	Lizhi Hou <lizhi.hou@....com>,
	Oded Gabbay <ogabbay@...nel.org>
Cc: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Zishun Yi <zishun.yi.dev@...il.com>
Subject: [PATCH] accel/amdxdna: Fix memory leak in amdxdna_ubuf_map

From: Zishun Yi <zishun.yi.dev@...il.com>

The amdxdna_ubuf_map() function allocates memory for sg and
internal sg table structures, but it fails to free them if subsequent
operations (sg_alloc_table_from_pages or dma_map_sgtable) fail.

Signed-off-by: Zishun Yi <zishun.yi.dev@...il.com>
---
 drivers/accel/amdxdna/amdxdna_ubuf.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/accel/amdxdna/amdxdna_ubuf.c b/drivers/accel/amdxdna/amdxdna_ubuf.c
index 077b2261cf2a..9e3b3b055caa 100644
--- a/drivers/accel/amdxdna/amdxdna_ubuf.c
+++ b/drivers/accel/amdxdna/amdxdna_ubuf.c
@@ -34,15 +34,21 @@ static struct sg_table *amdxdna_ubuf_map(struct dma_buf_attachment *attach,
 	ret = sg_alloc_table_from_pages(sg, ubuf->pages, ubuf->nr_pages, 0,
 					ubuf->nr_pages << PAGE_SHIFT, GFP_KERNEL);
 	if (ret)
-		return ERR_PTR(ret);
+		goto err_free_sg;
 
 	if (ubuf->flags & AMDXDNA_UBUF_FLAG_MAP_DMA) {
 		ret = dma_map_sgtable(attach->dev, sg, direction, 0);
 		if (ret)
-			return ERR_PTR(ret);
+			goto err_free_table;
 	}
 
 	return sg;
+
+err_free_table:
+	sg_free_table(sg);
+err_free_sg:
+	kfree(sg);
+	return ERR_PTR(ret);
 }
 
 static void amdxdna_ubuf_unmap(struct dma_buf_attachment *attach,
-- 
2.51.2