path: root/drivers
diff options
authorBjørn Mork <bjorn@mork.no>2015-05-22 13:15:22 +0200
committerDavid S. Miller <davem@davemloft.net>2015-05-22 14:26:31 -0400
commit44f6731d8b68fa02f5ed65eaceac41f8c3c9279e (patch)
tree56c9360d6cae85fc174784af990aebb010ee45e6 /drivers
parent572152adfba711f770fc7ec5d140070a91d8e045 (diff)
cdc_ncm: Fix tx_bytes statistics
The tx_curr_frame_payload field is u32. When we try to calculate a small negative delta based on it, we end up with a positive integer close to 2^32 instead. So the tx_bytes pointer increases by about 2^32 for every transmitted frame. Fix by calculating the delta as a signed long. Cc: Ben Hutchings <ben.hutchings@codethink.co.uk> Reported-by: Florian Bruhin <me@the-compiler.org> Fixes: 7a1e890e2168 ("usbnet: Fix tx_bytes statistic running backward in cdc_ncm") Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index c3e4da9e79ca..8067b8fbb0ee 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -1182,7 +1182,7 @@ cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
* payload data instead.
usbnet_set_skb_tx_stats(skb_out, n,
- ctx->tx_curr_frame_payload - skb_out->len);
+ (long)ctx->tx_curr_frame_payload - skb_out->len);
return skb_out;

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