* [patch 2/2] tipc: potential divide by zero in tipc_link_recv_fragment()
@ 2013-05-06 18:29 Dan Carpenter
2013-05-06 18:38 ` Sergei Shtylyov
0 siblings, 1 reply; 5+ messages in thread
From: Dan Carpenter @ 2013-05-06 18:29 UTC (permalink / raw)
To: Jon Maloy
Cc: Allan Stephens, David S. Miller, netdev, tipc-discussion,
kernel-janitors
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>
diff --git a/net/tipc/link.c b/net/tipc/link.c
index 3a6064b3..de94493 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;
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [patch 2/2] tipc: potential divide by zero in tipc_link_recv_fragment()
2013-05-06 18:29 [patch 2/2] tipc: potential divide by zero in tipc_link_recv_fragment() Dan Carpenter
@ 2013-05-06 18:38 ` Sergei Shtylyov
2013-05-06 18:49 ` Dan Carpenter
2013-05-06 19:31 ` [patch 2/2 v2] " Dan Carpenter
0 siblings, 2 replies; 5+ messages in thread
From: Sergei Shtylyov @ 2013-05-06 18:38 UTC (permalink / raw)
To: Dan Carpenter
Cc: Jon Maloy, Allan Stephens, David S. Miller, netdev,
tipc-discussion, kernel-janitors
Hello.
On 06-05-2013 22:29, Dan Carpenter wrote:
> 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>
> diff --git a/net/tipc/link.c b/net/tipc/link.c
> index 3a6064b3..de94493 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);
Don't you think spaces around / should be added at least for
consistency with %?
WBR, Sergei
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [patch 2/2] tipc: potential divide by zero in tipc_link_recv_fragment()
2013-05-06 18:38 ` Sergei Shtylyov
@ 2013-05-06 18:49 ` Dan Carpenter
2013-05-06 19:31 ` [patch 2/2 v2] " Dan Carpenter
1 sibling, 0 replies; 5+ messages in thread
From: Dan Carpenter @ 2013-05-06 18:49 UTC (permalink / raw)
To: Sergei Shtylyov
Cc: Jon Maloy, Allan Stephens, David S. Miller, netdev,
tipc-discussion, kernel-janitors
On Mon, May 06, 2013 at 10:38:53PM +0400, Sergei Shtylyov wrote:
> Hello.
>
> On 06-05-2013 22:29, Dan Carpenter wrote:
>
> >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>
>
> >diff --git a/net/tipc/link.c b/net/tipc/link.c
> >index 3a6064b3..de94493 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);
>
> Don't you think spaces around / should be added at least for
> consistency with %?
Yep. I missed that. I'll resend.
regards,
dan carpenter
^ permalink raw reply [flat|nested] 5+ messages in thread* [patch 2/2 v2] tipc: potential divide by zero in tipc_link_recv_fragment()
2013-05-06 18:38 ` Sergei Shtylyov
2013-05-06 18:49 ` Dan Carpenter
@ 2013-05-06 19:31 ` Dan Carpenter
2013-05-06 20:17 ` David Miller
1 sibling, 1 reply; 5+ messages in thread
From: Dan Carpenter @ 2013-05-06 19:31 UTC (permalink / raw)
To: Jon Maloy
Cc: Allan Stephens, David S. Miller, netdev, tipc-discussion,
kernel-janitors, Sergei Shtylyov
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>
---
v2: fix a whitespace issue
diff --git a/net/tipc/link.c b/net/tipc/link.c
index 3a6064b3..de94493 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;
^ permalink raw reply related [flat|nested] 5+ messages in thread
end of thread, other threads:[~2013-05-06 20:17 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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2013-05-06 18:29 [patch 2/2] tipc: potential divide by zero in tipc_link_recv_fragment() Dan Carpenter
2013-05-06 18:38 ` Sergei Shtylyov
2013-05-06 18:49 ` Dan Carpenter
2013-05-06 19:31 ` [patch 2/2 v2] " Dan Carpenter
2013-05-06 20:17 ` David Miller
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