diff mbox series

[net-next,v4,2/2] net: qualcomm: rmnet: Fix rx_handler for non-linear skbs

Message ID 1612365335-14117-2-git-send-email-loic.poulain@linaro.org (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series [net-next,v4,1/2] net: mhi-net: Add de-aggeration support | expand

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netdev/tree_selection success Clearly marked for net-next
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netdev/cc_maintainers success CCed 5 of 5 maintainers
netdev/source_inline success Was 0 now: 0
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netdev/module_param success Was 0 now: 0
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/kdoc success Errors and warnings before: 0 this patch: 0
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netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 11 lines checked
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/header_inline success Link
netdev/stable success Stable not CCed

Commit Message

Loic Poulain Feb. 3, 2021, 3:15 p.m. UTC 
There is no guarantee that rmnet rx_handler is only fed with linear
skbs, but current rmnet implementation does not check that, leading
to crash in case of non linear skbs processed as linear ones.

Fix that by ensuring skb linearization before processing.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Acked-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
---
 v2: Add this patch to the series to prevent crash
 v3: no change
 v4: Fix skb leak in case of skb_linearize failure

 drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
index 3d7d3ab..3d00b32 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
@@ -183,6 +183,11 @@  rx_handler_result_t rmnet_rx_handler(struct sk_buff **pskb)
 	if (!skb)
 		goto done;
 
+	if (skb_linearize(skb)) {
+		kfree_skb(skb);
+		goto done;
+	}
+
 	if (skb->pkt_type == PACKET_LOOPBACK)
 		return RX_HANDLER_PASS;