6.7-stable review patch. If anyone has any objections, please let me know.
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From: Michael Lass bevan@bi-co.net
commit fe92f874f09145a6951deacaa4961390238bbe0d upstream.
While inlining csum_and_memcpy() into memcpy_to_iter_csum(), the from address passed to csum_partial_copy_nocheck() was accidentally changed. This causes a regression in applications using UDP, as for example OpenAFS, causing loss of datagrams.
Fixes: dc32bff195b4 ("iov_iter, net: Fold in csum_and_memcpy()") Cc: David Howells dhowells@redhat.com Cc: stable@vger.kernel.org Cc: regressions@lists.linux.dev Signed-off-by: Michael Lass bevan@bi-co.net Reviewed-by: Jeffrey Altman jaltman@auristor.com Acked-by: David Howells dhowells@redhat.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/core/datagram.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -751,7 +751,7 @@ size_t memcpy_to_iter_csum(void *iter_to size_t len, void *from, void *priv2) { __wsum *csum = priv2; - __wsum next = csum_partial_copy_nocheck(from, iter_to, len); + __wsum next = csum_partial_copy_nocheck(from + progress, iter_to, len);
*csum = csum_block_add(*csum, next, progress); return 0;