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| author | Erik Hugne <erik.hugne@ericsson.com> | 2013-11-13 12:35:11 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-11-15 12:11:06 +0400 |
| commit | 3db0a197ed86317ab2915bc8bddb91807b0f0e96 (patch) | |
| tree | c9209a27ba6e8a40665f0a509685854ceba3d63c /net | |
| parent | c9e9042994d37cbc1ee538c500e9da1bb9d1bcdf (diff) | |
| download | linux-3db0a197ed86317ab2915bc8bddb91807b0f0e96.tar.xz | |
tipc: fix dereference before check warning
This fixes the following Smatch warning:
net/tipc/link.c:2364 tipc_link_recv_fragment()
warn: variable dereferenced before check '*head' (see line 2361)
A null pointer might be passed to skb_try_coalesce if
a malicious sender injects orphan fragments on a link.
Signed-off-by: Erik Hugne <erik.hugne@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/tipc/link.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/tipc/link.c b/net/tipc/link.c index cf465d66ccde..69cd9bf3f561 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -2358,7 +2358,8 @@ int tipc_link_recv_fragment(struct sk_buff **head, struct sk_buff **tail, *head = frag; skb_frag_list_init(*head); return 0; - } else if (skb_try_coalesce(*head, frag, &headstolen, &delta)) { + } else if (*head && + skb_try_coalesce(*head, frag, &headstolen, &delta)) { kfree_skb_partial(frag, headstolen); } else { if (!*head) |