linux-kernel - [PATCH v2] usb: host: xhci: Fix potential memory leak in xhci_alloc_stream

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Date:   Fri,  1 Jul 2022 15:10:02 +0800
From:   Jianglei Nie <niejianglei2021@....com>
To:     mathias.nyman@...el.com, gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jianglei Nie <niejianglei2021@....com>
Subject: [PATCH v2] usb: host: xhci: Fix potential memory leak in xhci_alloc_stream_info()

xhci_alloc_stream_info() allocates stream context array for stream_info
->stream_ctx_array with xhci_alloc_stream_ctx(). When some error occurs,
stream_info->stream_ctx_array is not released, which will lead to a
memory leak.

We can fix it by releasing the stream_info->stream_ctx_array with
xhci_free_stream_ctx() on the error path to avoid the potential memory
leak.

Signed-off-by: Jianglei Nie <niejianglei2021@....com>
---
 drivers/usb/host/xhci-mem.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 8c19e151a945..9e56aa28efcd 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -641,7 +641,7 @@ struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci,
 			num_stream_ctxs, &stream_info->ctx_array_dma,
 			mem_flags);
 	if (!stream_info->stream_ctx_array)
-		goto cleanup_ctx;
+		goto cleanup_ring_array;
 	memset(stream_info->stream_ctx_array, 0,
 			sizeof(struct xhci_stream_ctx)*num_stream_ctxs);
 
@@ -702,6 +702,11 @@ struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci,
 	}
 	xhci_free_command(xhci, stream_info->free_streams_command);
 cleanup_ctx:
+	xhci_free_stream_ctx(xhci,
+		stream_info->num_stream_ctxs,
+		stream_info->stream_ctx_array,
+		stream_info->ctx_array_dma);
+cleanup_ring_array:
 	kfree(stream_info->stream_rings);
 cleanup_info:
 	kfree(stream_info);
-- 
2.25.1