diff options
| author |   Dan Carpenter <dan.carpenter@oracle.com> | 2013-05-06 09:31:17 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2013-05-06 16:16:52 -0400 |
| commit | 6bf15191f666c5965d212561d7a5c7b78b808dfa (patch) | |
| tree | f8181fc3a6d91819c5da72989b185e4a7f78905f /net/tipc | |
| parent | tipc: add a bounds check in link_recv_changeover_msg() (diff) | |
| download | linux-dev-6bf15191f666c5965d212561d7a5c7b78b808dfa.tar.xz linux-dev-6bf15191f666c5965d212561d7a5c7b78b808dfa.zip | |
tipc: potential divide by zero in tipc_link_recv_fragment()
The worry here is that fragm_sz could be zero since it comes from
skb->data.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc')
| -rw-r--r-- | net/tipc/link.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/tipc/link.c b/net/tipc/link.c index 3a6064b3d666..a80feee5197a 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -2524,14 +2524,16 @@ int tipc_link_recv_fragment(struct sk_buff **pending, struct sk_buff **fb, struct tipc_msg *imsg = (struct tipc_msg *)msg_data(fragm); u32 msg_sz = msg_size(imsg); u32 fragm_sz = msg_data_sz(fragm); - u32 exp_fragm_cnt = msg_sz/fragm_sz + !!(msg_sz % fragm_sz); + u32 exp_fragm_cnt; u32 max = TIPC_MAX_USER_MSG_SIZE + NAMED_H_SIZE; + if (msg_type(imsg) == TIPC_MCAST_MSG) max = TIPC_MAX_USER_MSG_SIZE + MCAST_H_SIZE; - if (msg_size(imsg) > max) { + if (fragm_sz == 0 || msg_size(imsg) > max) { kfree_skb(fbuf); return 0; } + exp_fragm_cnt = msg_sz / fragm_sz + !!(msg_sz % fragm_sz); pbuf = tipc_buf_acquire(msg_size(imsg)); if (pbuf != NULL) { pbuf->next = *pending; |