From 1ae2eaaa229bc350b6f38fbf4ab9c873532aecfb Mon Sep 17 00:00:00 2001 From: Marcelo Ricardo Leitner Date: Tue, 3 Oct 2017 19:20:08 -0300 Subject: [PATCH] sctp: silence warns on sctp_stream_init allocations 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 Tested-by: Xin Long Signed-off-by: Marcelo Ricardo Leitner Signed-off-by: David S. Miller --- net/sctp/stream.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/net/sctp/stream.c b/net/sctp/stream.c index 63ea15503714..1afa95558083 100644 --- a/net/sctp/stream.c +++ b/net/sctp/stream.c @@ -40,9 +40,14 @@ int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt, { 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 *stream, __u16 outcnt, __u16 incnt, for (i = 0; i < stream->outcnt; i++) stream->out[i].state = SCTP_STREAM_OPEN; +in: if (!incnt) return 0; -- GitLab