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