On Thursday 14 June 2012 22:21:28 Antonio Quartulli wrote:
skb_linearize(skb) possibly rearranges the skb internal data and then changes the skb->data pointer value. For this reason any other pointer in the code that was assigned skb->data before invoking skb_linearise(skb) must be re-assigned.
In the current tt_query message handling code this is not done and therefore, in case of skb linearization, the pointer used to handle the packet header ends up in pointing to poisoned memory. The packet is then dropped but the translation-table mechanism is corrupted.
Signed-off-by: Antonio Quartulli ordex@autistici.org
*** this patch is an important fix and it is for maint ***
Don't forget to add
Cc: stable stable@vger.kernel.org
to the patch and a small explanation since when the bug is there (I guess v3.1) and that it may lead to crashes and not only poisened memory (that is the best case.. but maybe the page was removed and we end up in hell when accessing the memory region).
Kind regards, Sven