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Michael reported an UDP breakage caused by the commitb65ac44674("udp: try to avoid 2 cache miss on dequeue"). The function __first_packet_length() can update the checksum bits of the pending skb, making the scratched area out-of-sync, and setting skb->csum, if the skb was previously in need of checksum validation. On later recvmsg() for such skb, checksum validation will be invoked again - due to the wrong udp_skb_csum_unnecessary() value - and will fail, causing the valid skb to be dropped. This change addresses the issue refreshing the scratch area in __first_packet_length() after the possible checksum update. Fixes:b65ac44674("udp: try to avoid 2 cache miss on dequeue") Reported-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.