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Fix GH-21023: CURLOPT_XFERINFOFUNCTION with invalid callback crash. #21025

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Fix GH-21023: CURLOPT_XFERINFOFUNCTION with invalid callback crash. #21025

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e649047
Fix GH-21023: CURLOPT_XFERINFOFUNCTION with invalid callback crash.
devnexen Jan 24, 2026
0812a00
review + fixing FNMATCH case as well.
devnexen Jan 26, 2026
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10 changes: 10 additions & 0 deletions ext/curl/interface.c
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Original file line number Diff line number Diff line change
Expand Up @@ -621,6 +621,10 @@ static int curl_fnmatch(void *ctx, const char *pattern, const char *string)
zval argv[3];
zval retval;

if (!ZEND_FCC_INITIALIZED(ch->handlers.fnmatch)) {
return rval;
}

GC_ADDREF(&ch->std);
ZVAL_OBJ(&argv[0], &ch->std);
ZVAL_STRING(&argv[1], pattern);
Expand Down Expand Up @@ -652,6 +656,9 @@ static int curl_progress(void *clientp, double dltotal, double dlnow, double ult
fprintf(stderr, "curl_progress() called\n");
fprintf(stderr, "clientp = %x, dltotal = %f, dlnow = %f, ultotal = %f, ulnow = %f\n", clientp, dltotal, dlnow, ultotal, ulnow);
#endif
if (!ZEND_FCC_INITIALIZED(ch->handlers.progress)) {
return rval;
}
Comment on lines +660 to +661
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@Girgias Girgias Jan 24, 2026

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I don't really understand how this can happen. It shouldn't be possible for this state to arise as this condition should be caught by the HANDLE_CURL_OPTION_CALLABLE, no? Or am I missing something here?

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@devnexen devnexen Jan 24, 2026

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no it is not, when I debugged php_curl_set_callable_handler earlier, the fcc was not initialised despite being succesful.

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@Girgias Girgias Jan 26, 2026

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This ... is strange. Because this would imply all the other callable options suffer from the same problem. Or do they not?

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@devnexen devnexen Jan 26, 2026

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and yes

<?php
$ch = curl_init();

curl_setopt($ch, CURLOPT_WILDCARDMATCH, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

curl_setopt($ch, CURLOPT_FNMATCH_FUNCTION, $callback);

curl_setopt($ch, CURLOPT_URL, "ftp://ftp.gnu.org/gnu/README*");

$result = curl_exec($ch);
var_dump($result);
curl_close($ch);
sapi/cli/php c.php 

Warning: Undefined variable $callback in /home/dcarlier/php-src/c.php on line 11
/home/dcarlier/php-src/Zend/zend_API.h:847:6: runtime error: member access within null pointer of type 'zend_function' (aka 'union _zend_function')
    #0 0x5e79794f0d3e in zend_call_known_fcc /home/dcarlier/php-src/Zend/zend_API.h:847:6
    #1 0x5e79794f6918 in curl_fnmatch /home/dcarlier/php-src/ext/curl/interface.c:630:2
    #2 0x78a14153345d  (/lib/x86_64-linux-gnu/libcurl.so.4+0x3c45d) (BuildId: 8b03052c795c3defd8539716e1150b035b0c1a0c)
    #3 0x78a14153437c  (/lib/x86_64-linux-gnu/libcurl.so.4+0x3d37c) (BuildId: 8b03052c795c3defd8539716e1150b035b0c1a0c)
    #4 0x78a14152d1b1  (/lib/x86_64-linux-gnu/libcurl.so.4+0x361b1) (BuildId: 8b03052c795c3defd8539716e1150b035b0c1a0c)
    #5 0x78a14152d837  (/lib/x86_64-linux-gnu/libcurl.so.4+0x36837) (BuildId: 8b03052c795c3defd8539716e1150b035b0c1a0c)
    #6 0x78a14152d9c3  (/lib/x86_64-linux-gnu/libcurl.so.4+0x369c3) (BuildId: 8b03052c795c3defd8539716e1150b035b0c1a0c)
    #7 0x78a141531ce3  (/lib/x86_64-linux-gnu/libcurl.so.4+0x3ace3) (BuildId: 8b03052c795c3defd8539716e1150b035b0c1a0c)
    #8 0x78a14152de41  (/lib/x86_64-linux-gnu/libcurl.so.4+0x36e41) (BuildId: 8b03052c795c3defd8539716e1150b035b0c1a0c)
    #9 0x78a14157e1c8  (/lib/x86_64-linux-gnu/libcurl.so.4+0x871c8) (BuildId: 8b03052c795c3defd8539716e1150b035b0c1a0c)
    #10 0x78a141576e68  (/lib/x86_64-linux-gnu/libcurl.so.4+0x7fe68) (BuildId: 8b03052c795c3defd8539716e1150b035b0c1a0c)
    #11 0x78a14158b981  (/lib/x86_64-linux-gnu/libcurl.so.4+0x94981) (BuildId: 8b03052c795c3defd8539716e1150b035b0c1a0c)
    #12 0x78a14156f5d6  (/lib/x86_64-linux-gnu/libcurl.so.4+0x785d6) (BuildId: 8b03052c795c3defd8539716e1150b035b0c1a0c)
    #13 0x78a141570bab in curl_multi_perform (/lib/x86_64-linux-gnu/libcurl.so.4+0x79bab) (BuildId: 8b03052c795c3defd8539716e1150b035b0c1a0c)
    #14 0x78a14153171e  (/lib/x86_64-linux-gnu/libcurl.so.4+0x3a71e) (BuildId: 8b03052c795c3defd8539716e1150b035b0c1a0c)
    #15 0x5e79794d89bc in zif_curl_exec /home/dcarlier/php-src/ext/curl/interface.c:2447:10
    #16 0x5e797cbb6240 in ZEND_DO_ICALL_SPEC_RETVAL_USED_HANDLER /home/dcarlier/php-src/Zend/zend_vm_execute.h:1351:2
    #17 0x5e797c758296 in execute_ex /home/dcarlier/php-src/Zend/zend_vm_execute.h:58658:7
    #18 0x5e797c75a04e in zend_execute /home/dcarlier/php-src/Zend/zend_vm_execute.h:64310:2
    #19 0x5e797d31820f in zend_execute_script /home/dcarlier/php-src/Zend/zend.c:1934:3
    #20 0x5e797be6a3c2 in php_execute_script_ex /home/dcarlier/php-src/main/main.c:2577:13
    #21 0x5e797be6b2a8 in php_execute_script /home/dcarlier/php-src/main/main.c:2617:9
    #22 0x5e797d32906b in do_cli /home/dcarlier/php-src/sapi/cli/php_cli.c:935:5
    #23 0x5e797d325081 in main /home/dcarlier/php-src/sapi/cli/php_cli.c:1310:18
    #24 0x78a140c2a574 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #25 0x78a140c2a627 in __libc_start_main csu/../csu/libc-start.c:360:3
    #26 0x5e7978c07d04 in _start (/home/dcarlier/php-src/sapi/cli/php+0x2a07d04) (BuildId: 2a17fa1bdb34187d3865febd5e9d28c620d82802)

SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/dcarlier/php-src/Zend/zend_API.h:847:6

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@devnexen devnexen Jan 26, 2026

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gonna plug the rest of callables..

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@devnexen devnexen Jan 26, 2026

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well that was easy, only fnmatch remained, debug however was already protected apparently.


zval args[5];
zval retval;
Expand Down Expand Up @@ -690,6 +697,9 @@ static int curl_xferinfo(void *clientp, curl_off_t dltotal, curl_off_t dlnow, cu
fprintf(stderr, "curl_xferinfo() called\n");
fprintf(stderr, "clientp = %x, dltotal = %ld, dlnow = %ld, ultotal = %ld, ulnow = %ld\n", clientp, dltotal, dlnow, ultotal, ulnow);
#endif
if (!ZEND_FCC_INITIALIZED(ch->handlers.xferinfo)) {
return rval;
}

zval argv[5];
zval retval;
Expand Down
27 changes: 27 additions & 0 deletions ext/curl/tests/gh21023.phpt
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@@ -0,0 +1,27 @@
--TEST--
GH-21023 (crash with CURLOPT_XFERINFOFUNCTION set with an invalid callback)
--EXTENSIONS--
curl
--FILE--
<?php
include 'server.inc';
$host = curl_cli_server_start();
$url = "{$host}/get.inc";
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_NOPROGRESS, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_XFERINFOFUNCTION, null);
curl_exec($ch);
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_PROGRESSFUNCTION, null);
curl_exec($ch);
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_WILDCARDMATCH, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FNMATCH_FUNCTION, null);
curl_exec($ch);
echo "OK", PHP_EOL;
?>
--EXPECT--
OK
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