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tipc: Prevent access of non-existent field in short message header

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This patch eliminates a case where TIPC's link code could try reading
a field that is not present in a short message header.  (The random
value obtained was not being used, but the read operation could result
in an invalid memory access exception in extremely rare circumstances.)

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Allan Stephens 2008-06-04 17:36:58 -07:00 committed by David S. Miller
parent 1265a02108
commit 9c396a7bfb
1 changed files with 3 additions and 1 deletions
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4
net/tipc/link.c
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@ -2674,10 +2674,12 @@ int tipc_link_send_long_buf(struct link *l_ptr, struct sk_buff *buf)
u32 pack_sz = link_max_pkt(l_ptr);
u32 fragm_sz = pack_sz - INT_H_SIZE;
u32 fragm_no = 1;
u32 destaddr = msg_destnode(inmsg);
u32 destaddr;
if (msg_short(inmsg))
destaddr = l_ptr->addr;
else
destaddr = msg_destnode(inmsg);
if (msg_routed(inmsg))
msg_set_prevnode(inmsg, tipc_own_addr);