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author | NeilBrown <neilb@suse.de> | 2021-02-05 03:36:30 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-23 17:00:58 +0300 |
commit | 7436ceb2b78f334e292d72bb3d2ca4d5deb367df (patch) | |
tree | 8b07e5a2fc52d42fe0ee5ef6d684611117483127 | |
parent | 8c8bae3a527ba8ca1adf2abe1147d3cc9c3dd684 (diff) | |
download | linux-7436ceb2b78f334e292d72bb3d2ca4d5deb367df.tar.xz |
net: fix iteration for sctp transport seq_files
commit af8085f3a4712c57d0dd415ad543bac85780375c upstream.
The sctp transport seq_file iterators take a reference to the transport
in the ->start and ->next functions and releases the reference in the
->show function. The preferred handling for such resources is to
release them in the subsequent ->next or ->stop function call.
Since Commit 1f4aace60b0e ("fs/seq_file.c: simplify seq_file iteration
code and interface") there is no guarantee that ->show will be called
after ->next, so this function can now leak references.
So move the sctp_transport_put() call to ->next and ->stop.
Fixes: 1f4aace60b0e ("fs/seq_file.c: simplify seq_file iteration code and interface")
Reported-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | net/sctp/proc.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/net/sctp/proc.c b/net/sctp/proc.c index a644292f9faf..84f79ac4b984 100644 --- a/net/sctp/proc.c +++ b/net/sctp/proc.c @@ -230,6 +230,12 @@ static void sctp_transport_seq_stop(struct seq_file *seq, void *v) { struct sctp_ht_iter *iter = seq->private; + if (v && v != SEQ_START_TOKEN) { + struct sctp_transport *transport = v; + + sctp_transport_put(transport); + } + sctp_transport_walk_stop(&iter->hti); } @@ -237,6 +243,12 @@ static void *sctp_transport_seq_next(struct seq_file *seq, void *v, loff_t *pos) { struct sctp_ht_iter *iter = seq->private; + if (v && v != SEQ_START_TOKEN) { + struct sctp_transport *transport = v; + + sctp_transport_put(transport); + } + ++*pos; return sctp_transport_get_next(seq_file_net(seq), &iter->hti); @@ -292,8 +304,6 @@ static int sctp_assocs_seq_show(struct seq_file *seq, void *v) sk->sk_rcvbuf); seq_printf(seq, "\n"); - sctp_transport_put(transport); - return 0; } @@ -369,8 +379,6 @@ static int sctp_remaddr_seq_show(struct seq_file *seq, void *v) seq_printf(seq, "\n"); } - sctp_transport_put(transport); - return 0; } |