[PATCH 6.8 077/399] usb: xhci: Add error handling in xhci_map_urb_for_dma

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6.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Prashanth K <quic_prashk@xxxxxxxxxxx>

[ Upstream commit be95cc6d71dfd0cba66e3621c65413321b398052 ]

Currently xhci_map_urb_for_dma() creates a temporary buffer and copies
the SG list to the new linear buffer. But if the kzalloc_node() fails,
then the following sg_pcopy_to_buffer() can lead to crash since it
tries to memcpy to NULL pointer.

So return -ENOMEM if kzalloc returns null pointer.

Cc: stable@xxxxxxxxxxxxxxx # 5.11
Fixes: 2017a1e58472 ("usb: xhci: Use temporary buffer to consolidate SG")
Signed-off-by: Prashanth K <quic_prashk@xxxxxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240229141438.619372-10-mathias.nyman@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/usb/host/xhci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 0886829d53e51..afccd58c9a75a 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1220,6 +1220,8 @@ static int xhci_map_temp_buffer(struct usb_hcd *hcd, struct urb *urb)
 
 	temp = kzalloc_node(buf_len, GFP_ATOMIC,
 			    dev_to_node(hcd->self.sysdev));
+	if (!temp)
+		return -ENOMEM;
 
 	if (usb_urb_dir_out(urb))
 		sg_pcopy_to_buffer(urb->sg, urb->num_sgs,
-- 
2.43.0







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