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 -EAGAIN if kzalloc returns null pointer.
Cc: stable@vger.kernel.org # 5.11 Fixes: 2017a1e58472 ("usb: xhci: Use temporary buffer to consolidate SG") Signed-off-by: Prashanth K quic_prashk@quicinc.com --- drivers/usb/host/xhci.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index c057c42c36f4..0597a60bec34 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1218,6 +1218,9 @@ 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 -EAGAIN; + if (usb_urb_dir_out(urb)) sg_pcopy_to_buffer(urb->sg, urb->num_sgs, temp, buf_len, 0);
On 2/28/24 11:33 AM, Prashanth K wrote:
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 -EAGAIN if kzalloc returns null pointer.
Cc: stable@vger.kernel.org # 5.11 Fixes: 2017a1e58472 ("usb: xhci: Use temporary buffer to consolidate SG") Signed-off-by: Prashanth K quic_prashk@quicinc.com
drivers/usb/host/xhci.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index c057c42c36f4..0597a60bec34 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1218,6 +1218,9 @@ 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));
I don't think we need an empty line here.
- if (!temp)
return -EAGAIN;
Not -ENOMEM?
- if (usb_urb_dir_out(urb)) sg_pcopy_to_buffer(urb->sg, urb->num_sgs, temp, buf_len, 0);
MBR, Sergey
On 28-02-24 02:31 pm, Sergei Shtylyov wrote:
On 2/28/24 11:33 AM, Prashanth K wrote:
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 -EAGAIN if kzalloc returns null pointer.
Cc: stable@vger.kernel.org # 5.11 Fixes: 2017a1e58472 ("usb: xhci: Use temporary buffer to consolidate SG") Signed-off-by: Prashanth K quic_prashk@quicinc.com
drivers/usb/host/xhci.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index c057c42c36f4..0597a60bec34 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1218,6 +1218,9 @@ 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));
I don't think we need an empty line here.
- if (!temp)
return -EAGAIN;Not -ENOMEM?
Yea that sounds better, will update in next patch. Thanks!
linux-stable-mirror@lists.linaro.org
-
Prashanth K -
Sergei Shtylyov