4.9-stable review patch.  If anyone has any objections, please let me know.


From: Dave Watson <davejwat...@fb.com>

[ Upstream commit cd00edc179863848abab5cc5683de5b7b5f70954 ]

strp_parser_err is called with a negative code everywhere, which then
calls abort_parser with a negative code.  strp_msg_timeout calls
abort_parser directly with a positive code.  Negate ETIMEDOUT
to match signed-ness of other calls.

The default abort_parser callback, strp_abort_strp, sets
sk->sk_err to err.  Also negate the error here so sk_err always
holds a positive value, as the rest of the net code expects.  Currently
a negative sk_err can result in endless loops, or user code that
thinks it actually sent/received err bytes.

Found while testing net/tls_sw recv path.

Fixes: 43a0c6751a322847 ("strparser: Stream parser for messages")
Signed-off-by: Dave Watson <davejwat...@fb.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
 net/strparser/strparser.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/strparser/strparser.c
+++ b/net/strparser/strparser.c
@@ -59,7 +59,7 @@ static void strp_abort_rx_strp(struct st
        strp->rx_stopped = 1;
        /* Report an error on the lower socket */
-       csk->sk_err = err;
+       csk->sk_err = -err;
@@ -422,7 +422,7 @@ static void strp_rx_msg_timeout(unsigned
        /* Message assembly timed out */
-       strp->cb.abort_parser(strp, ETIMEDOUT);
+       strp->cb.abort_parser(strp, -ETIMEDOUT);

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