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[2006-08-11 09:46 UTC] rb at ez dot no
Description:
------------
The application I am writing uses the
stream_filter_append() function to inflate / decompress a
part of the file content. Unfortunately, this results into
a segmentation fault. I wrote a small script to reproduce
this problem, but that script hangs instead of segfaults.
There may be a relation.
Backtracing the segfault shows that there is a null
pointer assignment (thanks to Derick).
Reproduce code:
---------------
// Script that hangs.
// Compress
$fw = fopen( "myfile.txt", "r+b" );
stream_filter_append( $fw, "zlib.deflate");
fwrite( $fw, "Hello world" );
fclose($fw);
// Decompress
$fr = fopen( "myfile.txt", "r+b" );
stream_filter_append( $fr, "zlib.inflate");
echo fread( $fr, 100 );
fclose($fr);
Actual result:
--------------
// Backtrace from the crash ( brigade = 0x0 ).
Program received signal SIGSEGV, Segmentation fault.
0x081fcc88 in php_stream_bucket_unlink (bucket=0x885d0f4)
at /usr/local/php/php5/src/main/streams/filter.c:228
228 bucket->brigade->head =
bucket->next;
(gdb) print *bucket
$1 = {next = 0x0, prev = 0x0, brigade = 0x0,
buf = 0x8860cf5
"[\017TT?\231\177\203O\235\220?\231\032\210\230b|
f\237\t&8\202?F?\027P4??J\024+Y10???f\230?3o@??\0262`x??%'v?mm?\234???X\213?5\202\215???IҬ?\234mZ?)?\232?\004?1?\030Z?
????;?
\230??\234=g????}߽????{???7?}}Q?b\213?\"%?$i\204DX\203.
[g?l\233??gH\212d\2252?;???(\206\003\032@\003`\035",
buflen = 7762, own_buf = 0, is_persistent = 0, refcount =
0}
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Last updated: Sat Nov 08 23:00:01 2025 UTC |
Oops, forgot to attach the backtrace. Program received signal SIGSEGV, Segmentation fault. 0x081fcc88 in php_stream_bucket_unlink (bucket=0x884dbe4) at /usr/local/php/php5/src/main/streams/filter.c:228 228 bucket->brigade->head = bucket->next; (gdb) bt #0 0x081fcc88 in php_stream_bucket_unlink (bucket=0x884dbe4) at /usr/local/php/php5/src/main/streams/filter.c:228 #1 0x081fd0f2 in _php_stream_filter_append (chain=0x88603a4, filter=0x885ba74) at /usr/local/php/php5/src/main/streams/filter.c:370 #2 0x081d9f7d in apply_filter_to_stream (append=1, ht=0, return_value=0x885e0cc, return_value_ptr=0x0, this_ptr=0x0, return_value_used=1) at /usr/local/php/php5/src/ext/standard/streamsfuncs.c:1095 #3 0x081da065 in zif_stream_filter_append (ht=0, return_value=0x0, return_value_ptr=0x0, this_ptr=0x0, return_value_used=0) at /usr/local/php/php5/src/ext/standard/streamsfuncs.c:1133 #4 0x0823bcc0 in execute_internal (execute_data_ptr=0x0, return_value_used=0) at /usr/local/php/php5/src/Zend/zend_execute.c:1368 #5 0xb788e6cf in xdebug_execute_internal (current_execute_data=0xbf90be70, return_value_used=1) at /tmp/tmpOl29f1/xdebug-2.0.0beta5/xdebug.c:1299 #6 0x0823c557 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf90be70) at zend_vm_execute.h:202 #7 0x0823bdd8 in execute (op_array=0x87db654) at zend_vm_execute.h:92 #8 0xb788e437 in xdebug_execute (op_array=0x87db654) at /tmp/tmpOl29f1/xdebug-2.0.0beta5/xdebug.c:1242 #9 0x0823c2f1 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf90c3a0) at zend_vm_execute.h:234 #10 0x0823bdd8 in execute (op_array=0x879b41c) at zend_vm_execute.h:92 #11 0xb788e437 in xdebug_execute (op_array=0x879b41c) at /tmp/tmpOl29f1/xdebug-2.0.0beta5/xdebug.c:1242 #12 0x0823c2f1 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf90c560) at zend_vm_execute.h:234 #13 0x0823bdd8 in execute (op_array=0x8796654) at zend_vm_execute.h:92 #14 0xb788e437 in xdebug_execute (op_array=0x8796654) at /tmp/tmpOl29f1/xdebug-2.0.0beta5/xdebug.c:1242 #15 0x0823c2f1 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf90d220) at zend_vm_execute.h:234 #16 0x0823bdd8 in execute (op_array=0x878a904) at zend_vm_execute.h:92 #17 0xb788e437 in xdebug_execute (op_array=0x878a904) at /tmp/tmpOl29f1/xdebug-2.0.0beta5/xdebug.c:1242 #18 0x0823c2f1 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf90d480) at zend_vm_execute.h:234 #19 0x0823bdd8 in execute (op_array=0x873d50c) at zend_vm_execute.h:92 #20 0xb788e437 in xdebug_execute (op_array=0x873d50c) at /tmp/tmpOl29f1/xdebug-2.0.0beta5/xdebug.c:1242 #21 0x08219751 in zend_call_function (fci=0xbf90d640, fci_cache=0xbf90d630) at /usr/local/php/php5/src/Zend/zend_execute_API.c:938 #22 0x08119c68 in zif_reflection_method_invoke (ht=1, return_value=0x87f3d3c, return_value_ptr=0x0, this_ptr=0x880bd54, return_value_used=0) at /usr/local/php/php5/src/ext/reflection/php_reflection.c:2286 #23 0x0823bcc0 in execute_internal (execute_data_ptr=0x0, return_value_used=0) at /usr/local/php/php5/src/Zend/zend_execute.c:1368 #24 0xb788e6cf in xdebug_execute_internal (current_execute_data=0xbf90d940, return_value_used=0) at /tmp/tmpOl29f1/xdebug-2.0.0beta5/xdebug.c:1299 #25 0x0823c557 in zend_do_fcall_common_helper_SPEC (execute_data=0xbf90d940) at zend_vm_execute.h:202 #26 0x0823bdd8 in execute (op_array=0x875631c) at zend_vm_execute.h:92