-stable review patch. If anyone has any objections, please let us know.
------------------
From: Herbert Xu <[email protected]>
[NET]: Fix segmentation of linear packets
skb_segment fails to segment linear packets correctly because it
tries to write all linear parts of the original skb into each
segment. This will always panic as each segment only contains
enough space for one MSS.
This was not detected earlier because linear packets should be
rare for GSO. In fact it still remains to be seen what exactly
created the linear packets that triggered this bug. Basically
the only time this should happen is if someone enables GSO
emulation on an interface that does not support SG.
Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Chris Wright <[email protected]>
---
net/core/skbuff.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
--- linux-2.6.18.1.orig/net/core/skbuff.c
+++ linux-2.6.18.1/net/core/skbuff.c
@@ -1945,7 +1945,7 @@ struct sk_buff *skb_segment(struct sk_bu
do {
struct sk_buff *nskb;
skb_frag_t *frag;
- int hsize, nsize;
+ int hsize;
int k;
int size;
@@ -1956,11 +1956,10 @@ struct sk_buff *skb_segment(struct sk_bu
hsize = skb_headlen(skb) - offset;
if (hsize < 0)
hsize = 0;
- nsize = hsize + doffset;
- if (nsize > len + doffset || !sg)
- nsize = len + doffset;
+ if (hsize > len || !sg)
+ hsize = len;
- nskb = alloc_skb(nsize + headroom, GFP_ATOMIC);
+ nskb = alloc_skb(hsize + doffset + headroom, GFP_ATOMIC);
if (unlikely(!nskb))
goto err;
--