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sctp: silence warns on sctp_stream_init allocations

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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>
This commit is contained in:
Marcelo Ricardo Leitner 2017-10-03 19:20:08 -03:00 committed by David S. Miller
parent af14827fa3
commit 1ae2eaaa22
1 changed files with 7 additions and 1 deletions
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8
net/sctp/stream.c
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@ -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;