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https://gitlab.alpinelinux.org/alpine/aports.git
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24cdbb59af
http://portmedia.sourceforge.net/ PortMidi is a platform independent library for MIDI input/output.
70 lines
2.7 KiB
Diff
70 lines
2.7 KiB
Diff
Subject: Prevent SIGSEGV on handling events for already closed devices.
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Bug: http://sourceforge.net/apps/trac/portmedia/ticket/3
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Bug-Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=695842
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Bug-Ubuntu: https://launchpad.net/bugs/1073484
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Applied-Upstream: yes
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---
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pm_linux/pmlinuxalsa.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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--- portmidi-200.orig/pm_linux/pmlinuxalsa.c
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+++ portmidi-200/pm_linux/pmlinuxalsa.c
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@@ -193,6 +193,7 @@ static PmError alsa_write_byte(PmInterna
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snd_seq_event_t ev;
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int err;
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+ if (!desc) return pmBadPtr;
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snd_seq_ev_clear(&ev);
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if (snd_midi_event_encode_byte(desc->parser, byte, &ev) == 1) {
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snd_seq_ev_set_dest(&ev, desc->client, desc->port);
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@@ -339,6 +340,7 @@ static PmError alsa_in_close(PmInternal
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pm_hosterror = snd_seq_delete_port(seq, desc->this_port);
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}
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alsa_unuse_queue();
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+ midi->descriptor = NULL;
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pm_free(desc);
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if (pm_hosterror) {
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get_alsa_error_text(pm_hosterror_text, PM_HOST_ERROR_MSG_LEN,
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@@ -433,6 +435,7 @@ static PmError alsa_write(PmInternal *mi
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static PmError alsa_write_flush(PmInternal *midi, PmTimestamp timestamp)
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{
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alsa_descriptor_type desc = (alsa_descriptor_type) midi->descriptor;
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+ if (!desc) return pmBadPtr;
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VERBOSE printf("snd_seq_drain_output: 0x%x\n", (unsigned int) seq);
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desc->error = snd_seq_drain_output(seq);
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if (desc->error < 0) return pmHostError;
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@@ -448,6 +451,7 @@ static PmError alsa_write_short(PmIntern
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PmMessage msg = event->message;
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int i;
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alsa_descriptor_type desc = (alsa_descriptor_type) midi->descriptor;
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+ if (!desc) return pmBadPtr;
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for (i = 0; i < bytes; i++) {
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unsigned char byte = msg;
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VERBOSE printf("sending 0x%x\n", byte);
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@@ -481,6 +485,10 @@ static void handle_event(snd_seq_event_t
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{
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int device_id = ev->dest.port;
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PmInternal *midi = descriptors[device_id].internalDescriptor;
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+ /* The device we received events for might have been closed before we
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+ processed them. */
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+ if (!midi)
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+ return;
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PmEvent pm_ev;
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PmTimeProcPtr time_proc = midi->time_proc;
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PmTimestamp timestamp;
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@@ -650,6 +658,7 @@ static PmError alsa_poll(PmInternal *mid
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static unsigned int alsa_has_host_error(PmInternal *midi)
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{
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alsa_descriptor_type desc = (alsa_descriptor_type) midi->descriptor;
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+ if (!desc) return 0;
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return desc->error;
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}
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@@ -657,6 +666,7 @@ static unsigned int alsa_has_host_error(
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static void alsa_get_host_error(PmInternal *midi, char *msg, unsigned int len)
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{
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alsa_descriptor_type desc = (alsa_descriptor_type) midi->descriptor;
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+ if (!desc) return;
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int err = (pm_hosterror || desc->error);
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get_alsa_error_text(msg, len, err);
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}
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