This is a note to let you know that I've just added the patch titled sctp: fix err handling of stream initialization to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: sctp-fix-err-handling-of-stream-initialization.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 97d940e880223f65b405b8cd37a8d3ea6b75b7a2 Author: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx> Date: Fri Dec 20 15:03:44 2019 -0300 sctp: fix err handling of stream initialization [ Upstream commit 61d5d4062876e21331c3d0ba4b02dbd50c06a658 ] The fix on 951c6db954a1 fixed the issued reported there but introduced another. When the allocation fails within sctp_stream_init() it is okay/necessary to free the genradix. But it is also called when adding new streams, from sctp_send_add_streams() and sctp_process_strreset_addstrm_in() and in those situations it cannot just free the genradix because by then it is a fully operational association. The fix here then is to only free the genradix in sctp_stream_init() and on those other call sites move on with what it already had and let the subsequent error handling to handle it. Tested with the reproducers from this report and the previous one, with lksctp-tools and sctp-tests. Reported-by: syzbot+9a1bc632e78a1a98488b@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 951c6db954a1 ("sctp: fix memleak on err handling of stream initialization") Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/net/sctp/stream.c b/net/sctp/stream.c index 6a30392068a0..c1a100d2fed3 100644 --- a/net/sctp/stream.c +++ b/net/sctp/stream.c @@ -84,10 +84,8 @@ static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt, return 0; ret = genradix_prealloc(&stream->out, outcnt, gfp); - if (ret) { - genradix_free(&stream->out); + if (ret) return ret; - } stream->outcnt = outcnt; return 0; @@ -102,10 +100,8 @@ static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt, return 0; ret = genradix_prealloc(&stream->in, incnt, gfp); - if (ret) { - genradix_free(&stream->in); + if (ret) return ret; - } stream->incnt = incnt; return 0; @@ -123,7 +119,7 @@ int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt, * a new one with new outcnt to save memory if needed. */ if (outcnt == stream->outcnt) - goto in; + goto handle_in; /* Filter out chunks queued on streams that won't exist anymore */ sched->unsched_all(stream); @@ -132,24 +128,28 @@ int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt, ret = sctp_stream_alloc_out(stream, outcnt, gfp); if (ret) - goto out; + goto out_err; for (i = 0; i < stream->outcnt; i++) SCTP_SO(stream, i)->state = SCTP_STREAM_OPEN; -in: +handle_in: sctp_stream_interleave_init(stream); if (!incnt) goto out; ret = sctp_stream_alloc_in(stream, incnt, gfp); - if (ret) { - sched->free(stream); - genradix_free(&stream->out); - stream->outcnt = 0; - goto out; - } + if (ret) + goto in_err; + + goto out; +in_err: + sched->free(stream); + genradix_free(&stream->in); +out_err: + genradix_free(&stream->out); + stream->outcnt = 0; out: return ret; }