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net: dp83640: Avoid NULL pointer dereference. 

The function, skb_complete_tx_timestamp(), used to allow passing in a
NULL pointer for the time stamps, but that was changed in commit
62bccb8cdb ("net-timestamp: Make the
clone operation stand-alone from phy timestamping"), and the existing
call sites, all of which are in the dp83640 driver, were fixed up.

Even though the kernel-doc was subsequently updated in commit
7a76a021cd ("net-timestamp: Update
skb_complete_tx_timestamp comment"), still a bug fix from Manfred
Rudigier came into the driver using the old semantics.  Probably
Manfred derived that patch from an older kernel version.

This fix should be applied to the stable trees as well.

Fixes: 81e8f2e930 ("net: dp83640: Fix tx timestamp overflow handling.")
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Cochran 2017-06-23 17:51:31 +02:00 committed by David S. Miller
parent 43b786c676
commit db9d8b29d1
1 changed files with 1 additions and 1 deletions
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2
drivers/net/phy/dp83640.c
View File

@ -908,7 +908,7 @@ static void decode_txts(struct dp83640_private *dp83640,
if (overflow) {
pr_debug("tx timestamp queue overflow, count %d\n", overflow);
while (skb) {
skb_complete_tx_timestamp(skb, NULL);
kfree_skb(skb);
skb = skb_dequeue(&dp83640->tx_queue);
}
return;