This is a note to let you know that I've just added the patch titled
strparser: Fix sign of err codes
to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: strparser-fix-sign-of-err-codes.patch and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Wed Apr 11 10:26:56 CEST 2018
From: Dave Watson davejwatson@fb.com Date: Mon, 26 Mar 2018 12:31:21 -0700 Subject: strparser: Fix sign of err codes
From: Dave Watson davejwatson@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 davejwatson@fb.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@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; csk->sk_error_report(csk); }
@@ -422,7 +422,7 @@ static void strp_rx_msg_timeout(unsigned /* Message assembly timed out */ STRP_STATS_INCR(strp->stats.rx_msg_timeouts); lock_sock(strp->sk); - strp->cb.abort_parser(strp, ETIMEDOUT); + strp->cb.abort_parser(strp, -ETIMEDOUT); release_sock(strp->sk); }
Patches currently in stable-queue which might be from davejwatson@fb.com are
queue-4.9/strparser-fix-sign-of-err-codes.patch