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[2018-04-22 15:18 UTC] p dot mehrer at metaways dot de
Description:
------------
using a stream filter with convert.iconv and not enough input bytes leads to an infinite loop and one CPU Core at 100%
the test script should reproduce it very well. It is reproducable using the xenial packages as well as with a self compiled version (7.0.29) for better gdb trace.
Note: it only happens using a stream filter, php iconv() does not produce the issue.
0x00007fbaa84fc844 in __gconv (cd=0x1d30fc0, inbuf=inbuf@entry=0x7ffe4a741c30, inbufend=0x7fbaa5a71493 "",
outbuf=outbuf@entry=0x7ffe4a741c28, outbufend=<optimized out>, irreversible=irreversible@entry=0x7ffe4a741b98) at gconv.c:79
79 gconv.c: No such file or directory.
(gdb) bt
#0 0x00007fbaa84fc844 in __gconv (cd=0x1d30fc0, inbuf=inbuf@entry=0x7ffe4a741c30, inbufend=0x7fbaa5a71493 "",
outbuf=outbuf@entry=0x7ffe4a741c28, outbufend=<optimized out>, irreversible=irreversible@entry=0x7ffe4a741b98) at gconv.c:79
#1 0x00007fbaa84fc08f in iconv (cd=<optimized out>, inbuf=0x7ffe4a741c30, inbytesleft=0x7ffe4a741c48, outbuf=0x7ffe4a741c28,
outbytesleft=0x7ffe4a741c38) at iconv.c:52
#2 0x0000000000664aa8 in php_iconv_stream_filter_append_bucket (self=0x7fbaa5a71460, stream=0x7fbaa5a5ea00, filter=0x7fbaa5a68150,
buckets_out=0x7ffe4a741d80, ps=0x0, buf_len=0, consumed=0x7ffe4a741cf0, persistent=0)
at /home/osboxes/php7.0/php-src/ext/iconv/iconv.c:2629
#3 0x0000000000665423 in php_iconv_stream_filter_do_filter (stream=0x7fbaa5a5ea00, filter=0x7fbaa5a68150, buckets_in=0x7ffe4a741d90,
buckets_out=0x7ffe4a741d80, bytes_consumed=0x0, flags=2) at /home/osboxes/php7.0/php-src/ext/iconv/iconv.c:2828
#4 0x000000000081092c in _php_stream_fill_read_buffer (stream=0x7fbaa5a5ea00, size=8195)
at /home/osboxes/php7.0/php-src/main/streams/streams.c:593
#5 0x0000000000810fb7 in _php_stream_read (stream=0x7fbaa5a5ea00, buf=0x7fbaa5a79018 "\205", size=8195)
at /home/osboxes/php7.0/php-src/main/streams/streams.c:722
#6 0x0000000000812ba0 in _php_stream_copy_to_mem (src=0x7fbaa5a5ea00, maxlen=0, persistent=0, __php_stream_call_depth=0,
__zend_filename=0xd96d78 "/home/osboxes/php7.0/php-src/ext/standard/streamsfuncs.c", __zend_lineno=443, __zend_orig_filename=0x0,
__zend_orig_lineno=0) at /home/osboxes/php7.0/php-src/main/streams/streams.c:1473
#7 0x00000000007d4496 in zif_stream_get_contents (execute_data=0x7fbaa5a14100, return_value=0x7fbaa5a140f0)
at /home/osboxes/php7.0/php-src/ext/standard/streamsfuncs.c:443
#8 0x00000000008ea263 in ZEND_DO_ICALL_SPEC_HANDLER () at /home/osboxes/php7.0/php-src/Zend/zend_vm_execute.h:586
#9 0x00000000008e9c8f in execute_ex (ex=0x7fbaa5a14030) at /home/osboxes/php7.0/php-src/Zend/zend_vm_execute.h:414
#10 0x00000000008e9da0 in zend_execute (op_array=0x7fbaa5a83000, return_value=0x0)
at /home/osboxes/php7.0/php-src/Zend/zend_vm_execute.h:458
#11 0x000000000088a32a in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /home/osboxes/php7.0/php-src/Zend/zend.c:1445
#12 0x00000000007f1fd8 in php_execute_script (primary_file=0x7ffe4a744680) at /home/osboxes/php7.0/php-src/main/main.c:2516
#13 0x0000000000953517 in do_cli (argc=2, argv=0x1c312d0) at /home/osboxes/php7.0/php-src/sapi/cli/php_cli.c:977
#14 0x00000000009546e5 in main (argc=2, argv=0x1c312d0) at /home/osboxes/php7.0/php-src/sapi/cli/php_cli.c:1347
Test script:
---------------
<?php
$fh = fopen('php://memory', 'rw');
fwrite($fh, "abc");
rewind($fh);
stream_filter_append($fh, 'convert.iconv.iso-10646/utf8//IGNORE', STREAM_FILTER_READ, []);
echo stream_get_contents($fh);
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Last updated: Mon Nov 03 20:00:02 2025 UTC |
this patch seems to fix the issue: diff --git a/ext/iconv/iconv.c b/ext/iconv/iconv.c index 47aa983..789a4ce 100644 --- a/ext/iconv/iconv.c +++ b/ext/iconv/iconv.c @@ -2648,6 +2648,8 @@ static int php_iconv_stream_filter_append_bucket( tcnt = 0; break; } + } else { + tcnt = 0; } break;after some meditation I have to change the description of the bug to: a stream filter with convert.iconv will end up in an endless loop if the last bytes in the stream (before EOF) are a illegal character sequence. the patch to fix this is: diff --git a/ext/iconv/iconv.c b/ext/iconv/iconv.c index 47aa983..3d0ce76 100644 --- a/ext/iconv/iconv.c +++ b/ext/iconv/iconv.c @@ -2648,6 +2648,9 @@ static int php_iconv_stream_filter_append_bucket( tcnt = 0; break; } + } else { + php_error_docref(NULL, E_WARNING, "iconv stream filter (\"%s\"=>\"%s\"): invalid multibyte sequence", self->from_charset, self->to_charset); + goto out_failure; } break; also the //ignore part (_php_check_ignore) is not taking into consideration in the stream filter. That's an other bug to me.