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[2002-07-09 06:25 UTC] twan at bitpress dot nl
L.S.,
In a futile attempt to make a clickable image in a Flash movie, I encountered something I think should not happen at all. While I may be unexperienced using Ming and am probably doing something wrong in my efforts, a segmentation fault I think is not appropriate :)
[Tue Jul 9 11:45:18 2002] [notice] child pid 6277 exit signal Segmentation fault (11)
I am running Apache 1.3.26-1, PHP 4.2.1-3 and Ming 0.2a.cvs20020110-3 on a Debian/GNU Linux system. Each time the following script is executed, the Apache childe crashes with a segmentation fault:
<?php
$filename = "result.jpg";
$fp = fopen($filename,"r");
$i = fread($fp,999999);
$img = new SWFBitmap($i); #don't give "fread(...)" as argument, but buffer it.
fclose($fp);
$s = new SWFShape();
#$s->setRightFill($s->addFill(0xff, 0, 0));
#$s->drawLine(100,0);
#$s->drawLine(0,100);
#$s->drawLine(-100,0);
#$s->drawLine(0,-100);
$s->setLeftFill($s->addFill($img));
$b = new SWFButton();
$b->addShape($s, SWFBUTTON_HIT | SWFBUTTON_UP | SWFBUTTON_DOWN | SWFBUTTON_OVER);
$b->addAction(new SWFAction("startDrag('/test', 0);"), // '0' means don't lock to mouse
SWFBUTTON_MOUSEDOWN);
$b->addAction(new SWFAction("stopDrag();"),
SWFBUTTON_MOUSEUP | SWFBUTTON_MOUSEUPOUTSIDE);
$p = new SWFSprite();
$p->add($b);
$p->nextFrame();
$swf = new SWFMovie();
$swf->setDimension(504, 501);
$i = $swf->add($p);
$i->setName('test');
$i->moveTo(100,100);
$swf->nextframe();
$swf->add($img); #this will create a shape with perfect proportions and fills it
header('Content-type: application/x-shockwave-flash');
$swf->output();
?>
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Last updated: Wed Dec 17 13:00:01 2025 UTC |
Reproduced with backtrace which shows the bug is clearly in the ming library: Program received signal SIGSEGV, Segmentation fault. 0x40187014 in SWFInput_buffer_getChar (input=0x830a468) at input.c:165 165 return ((unsigned char *)input->data)[input->offset++]; (gdb) bt #0 0x40187014 in SWFInput_buffer_getChar (input=0x830a468) at input.c:165 #1 0x40186b98 in SWFInput_getChar (input=0x830a468) at input.c:16 #2 0x401875eb in methodWriteJpegFile (input=0x830a468, method=0x814cd5c <phpByteOutputMethod>, data=0x0) at jpeg.c:89 #3 0x40187805 in writeSWFJpegBitmapToMethod (block=0x83905d0, method=0x814cd5c <phpByteOutputMethod>, data=0x0) at jpeg.c:181 #4 0x401844e9 in writeSWFBlockToMethod (block=0x83905d0, method=0x814cd5c <phpByteOutputMethod>, data=0x0) at block.c:87 #5 0x40172af8 in SWFBlockList_writeBlocksToMethod (list=0x8392010, method=0x814cd5c <phpByteOutputMethod>, data=0x0) at blocklist.c:78 #6 0x40171f12 in SWFMovie_output (movie=0x8391ff0, method=0x814cd5c <phpByteOutputMethod>, data=0x0) at movie.c:262 #7 0x0814cdae in zif_swfmovie_output (ht=0, return_value=0x83903e4, this_ptr=0x8391754, return_value_used=0) at /dat/dev/php/php-4.3.0dev/ext/ming/ming.c:1430 #8 0x080e1a8f in execute (op_array=0x838fb0c) at /dat/dev/php/php-4.3.0dev/Zend/zend_execute.c:1587 #9 0x407696e8 in xdebug_execute () from /dat/dev/php/xdebug/modules/xdebug.so #10 0x080d2532 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /dat/dev/php/php-4.3.0dev/Zend/zend.c:810 #11 0x080ac1ae in php_execute_script (primary_file=0xbffff680) at /dat/dev/php/php-4.3.0dev/main/main.c:1388 #12 0x080e63b6 in apache_php_module_main (r=0x83894f4, display_source_mode=0) ---Type <return> to continue, or q <return> to quit--- at /dat/dev/php/php-4.3.0dev/sapi/apache/sapi_apache.c:55 #13 0x0809d89c in send_php () #14 0x0809d8f5 in send_parsed_php () #15 0x0822b15f in ap_invoke_handler () #16 0x0823fd27 in process_request_internal () #17 0x0823fd88 in ap_process_request () #18 0x08236d31 in child_main () #19 0x08236edc in make_child () #20 0x08237050 in startup_children () #21 0x082376cc in standalone_main () #22 0x08237f3b in main () #23 0x4055d306 in __libc_start_main (main=0x8237b8c <main>, argc=2, ubp_av=0xbffffab4, init=0x807a28c <_init>, fini=0x824e660 <_fini>, rtld_fini=0x4000d2dc <_dl_fini>, stack_end=0xbffffaac) at ../sysdeps/generic/libc-start.c:129 (gdb) (gdb) print input $1 = 0x830a468 (gdb) print *input $2 = {destroy = 0x40186de8 <SWFInput_dtor>, getChar = 0x40186ff0 <SWFInput_buffer_getChar>, seek = 0x4018703c <SWFInput_buffer_seek>, eof = 0x40187020 <SWFInput_buffer_eof>, offset = 0, length = 127684, data = 0x4079702c} (gdb) print input.data $3 = (void *) 0x4079702c (gdb)