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dc4cf32a63
MonitorStream::processCommand computed buffer_level by dividing by temp_image_buffer_count (and via MOD_ADD modulo) while only guarding on playback_buffer. processCommand runs on the command_processor thread, started in runStream before temp_image_buffer_count is assigned from playback_buffer. In that window temp_image_buffer_count is still 0 while playback_buffer is already > 0, so a command arriving then divided by zero and raised SIGFPE, crashing nph-zms. Extract the percentage math into MonitorStreamBufferLevel which returns 0 when the buffer count is not positive, and add Catch2 coverage for the zero-count and wrap-around cases. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
54 lines
2.0 KiB
C++
54 lines
2.0 KiB
C++
/*
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* This file is part of the ZoneMinder Project. See AUTHORS file for contributors.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "zm_catch2.h"
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#include "zm_monitorstream.h"
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TEST_CASE("MonitorStreamBufferLevel") {
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SECTION("zero buffer count does not divide by zero") {
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// Regression for zoneminder/zoneminder#4936: processCommand() could run on
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// the command thread before runStream() assigned temp_image_buffer_count,
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// leaving it 0 while playback_buffer was already > 0, causing a SIGFPE.
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REQUIRE(MonitorStreamBufferLevel(0, 0, 0) == 0);
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REQUIRE(MonitorStreamBufferLevel(5, 2, 0) == 0);
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REQUIRE(MonitorStreamBufferLevel(0, 5, 0) == 0);
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}
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SECTION("negative buffer count is treated as empty") {
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REQUIRE(MonitorStreamBufferLevel(3, 1, -10) == 0);
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}
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SECTION("empty buffer reports 0%") {
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REQUIRE(MonitorStreamBufferLevel(0, 0, 100) == 0);
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}
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SECTION("full buffer reports nearly 100%") {
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// write wraps around to one behind read => count-1 of count slots used
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REQUIRE(MonitorStreamBufferLevel(99, 0, 100) == 99);
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}
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SECTION("half full buffer reports ~50%") {
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REQUIRE(MonitorStreamBufferLevel(50, 0, 100) == 50);
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}
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SECTION("wrap-around (write behind read) is handled modularly") {
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// write_index - read_index is negative; modular arithmetic keeps it in range
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REQUIRE(MonitorStreamBufferLevel(2, 7, 10) == 50);
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}
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}
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