This is a note to let you know that I've just added the patch titled

sctp: silence warns on sctp_stream_init allocations

to the 4.14-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: sctp-silence-warns-on-sctp_stream_init-allocations.patch and it can be found in the queue-4.14 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 Dec 20 18:17:52 CET 2017

From: Marcelo Ricardo Leitner marcelo.leitner@gmail.com Date: Tue, 3 Oct 2017 19:20:08 -0300 Subject: sctp: silence warns on sctp_stream_init allocations

From: Marcelo Ricardo Leitner marcelo.leitner@gmail.com

[ Upstream commit 1ae2eaaa229bc350b6f38fbf4ab9c873532aecfb ]

As SCTP supports up to 65535 streams, that can lead to very large allocations in sctp_stream_init(). As Xin Long noticed, systems with small amounts of memory are more prone to not have enough memory and dump warnings on dmesg initiated by user actions. Thus, silence them.

Also, if the reallocation of stream->out is not necessary, skip it and keep the memory we already have.

Reported-by: Xin Long lucien.xin@gmail.com Tested-by: Xin Long lucien.xin@gmail.com Signed-off-by: Marcelo Ricardo Leitner marcelo.leitner@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/sctp/stream.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/net/sctp/stream.c +++ b/net/sctp/stream.c @@ -40,9 +40,14 @@ int sctp_stream_init(struct sctp_stream { int i;

+ gfp |= __GFP_NOWARN; + /* Initial stream->out size may be very big, so free it and alloc - * a new one with new outcnt to save memory. + * a new one with new outcnt to save memory if needed. */ + if (outcnt == stream->outcnt) + goto in; + kfree(stream->out);

stream->out = kcalloc(outcnt, sizeof(*stream->out), gfp); @@ -53,6 +58,7 @@ int sctp_stream_init(struct sctp_stream for (i = 0; i < stream->outcnt; i++) stream->out[i].state = SCTP_STREAM_OPEN;

+in: if (!incnt) return 0;

Patches currently in stable-queue which might be from marcelo.leitner@gmail.com are

queue-4.14/sctp-silence-warns-on-sctp_stream_init-allocations.patch