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authorHerbert Xu <herbert@gondor.apana.org.au>2007-10-21 16:27:46 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-22 02:59:53 -0700
commitdeea84b0ae3d26b41502ae0a39fe7fe134e703d0 (patch)
tree4730d75c6e2edf50b0e61087178baa9092647b94 /include/linux
parentbfb85c9f753a7172bd962e8717118191dfd612cc (diff)
[NET]: Fix SKB_WITH_OVERHEAD calculation
The calculation in SKB_WITH_OVERHEAD is incorrect in that it can cause an overflow across a page boundary which is what it's meant to prevent. In particular, the header length (X) should not be lumped together with skb_shared_info. The latter needs to be aligned properly while the header has no choice but to sit in front of wherever the payload is. Therefore the correct calculation is to take away the aligned size of skb_shared_info, and then subtract the header length. The resulting quantity L satisfies the following inequality: SKB_DATA_ALIGN(L + X) + sizeof(struct skb_shared_info) <= PAGE_SIZE This is the quantity used by alloc_skb to do the actual allocation. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/skbuff.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index f93f22b3d2f..369f60a4797 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -41,8 +41,7 @@
#define SKB_DATA_ALIGN(X) (((X) + (SMP_CACHE_BYTES - 1)) & \
~(SMP_CACHE_BYTES - 1))
#define SKB_WITH_OVERHEAD(X) \
- (((X) - sizeof(struct skb_shared_info)) & \
- ~(SMP_CACHE_BYTES - 1))
+ ((X) - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
#define SKB_MAX_ORDER(X, ORDER) \
SKB_WITH_OVERHEAD((PAGE_SIZE << (ORDER)) - (X))
#define SKB_MAX_HEAD(X) (SKB_MAX_ORDER((X), 0))