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| author | Xie He <xie.he.0141@gmail.com> | 2020-11-12 13:35:06 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-11-24 15:27:18 +0300 |
| commit | dd7c76948628fb92faf794bc4fcfb662d6d395ce (patch) | |
| tree | b2dc15d96dda3464fe86002b4ec08ce70c3a8f7d | |
| parent | af1b19b16b91b685ce2c093d7cd1f936c2fd7fd8 (diff) | |
| download | linux-dd7c76948628fb92faf794bc4fcfb662d6d395ce.tar.xz | |
net: x25: Increase refcnt of "struct x25_neigh" in x25_rx_call_request
[ Upstream commit 4ee18c179e5e815fa5575e0d2db0c05795a804ee ]
The x25_disconnect function in x25_subr.c would decrease the refcount of
"x25->neighbour" (struct x25_neigh) and reset this pointer to NULL.
However, the x25_rx_call_request function in af_x25.c, which is called
when we receive a connection request, does not increase the refcount when
it assigns the pointer.
Fix this issue by increasing the refcount of "struct x25_neigh" in
x25_rx_call_request.
This patch fixes frequent kernel crashes when using AF_X25 sockets.
Fixes: 4becb7ee5b3d ("net/x25: Fix x25_neigh refcnt leak when x25 disconnect")
Cc: Martin Schiller <ms@dev.tdt.de>
Signed-off-by: Xie He <xie.he.0141@gmail.com>
Link: https://lore.kernel.org/r/20201112103506.5875-1-xie.he.0141@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/x25/af_x25.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c index 372f4194db5a..b3db0b0a52f5 100644 --- a/net/x25/af_x25.c +++ b/net/x25/af_x25.c @@ -1049,6 +1049,7 @@ int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb, makex25->lci = lci; makex25->dest_addr = dest_addr; makex25->source_addr = source_addr; + x25_neigh_hold(nb); makex25->neighbour = nb; makex25->facilities = facilities; makex25->dte_facilities= dte_facilities; |