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IPoIB: Fix crash in path_rec_completion()

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Fix a crash in path_rec_completion() during an SM up/down loop.  If
more than one path record request is issued, the first completion
releases path->done, allowing ipoib_flush_paths() to free the path,
and thus corrupting it for the second completion.

Commit ee1e2c82 ("IPoIB: Refresh paths instead of flushing them on SM
change events") added the field path->valid and changed the test "if
(!path)" to "if (!path || !path->valid)".  This change made it
possible for a path with an outstanding query to pass the test and
issue another query on the same path.  Having two queries on the same
path leads to a crash.

This fixes <https://bugs.openfabrics.org/show_bug.cgi?id=1325>.

Signed-off-by: Yossi Etigin <yosefe@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Yossi Etigin 2008-11-12 10:24:39 -08:00 committed by Roland Dreier
parent 93a3ab939b
commit ff79ae8083
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/ulp/ipoib/ipoib_main.c
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@ -664,7 +664,7 @@ static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
skb_push(skb, sizeof *phdr);
__skb_queue_tail(&path->queue, skb);
if (path_rec_start(dev, path)) {
if (!path->query && path_rec_start(dev, path)) {
spin_unlock_irqrestore(&priv->lock, flags);
path_free(dev, path);
return;