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Fix GH-17989: mb_output_handler crash with unset http_output_conv_mimetypes #17996

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Fix GH-17989: mb_output_handler crash with unset http_output_conv_mimetypes #17996

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4 changes: 3 additions & 1 deletion ext/mbstring/mbstring.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1567,7 +1567,9 @@ PHP_FUNCTION(mb_output_handler)
char *mimetype = NULL;

/* Analyze mime type */
if (SG(sapi_headers).mimetype && _php_mb_match_regex(MBSTRG(http_output_conv_mimetypes), SG(sapi_headers).mimetype, strlen(SG(sapi_headers).mimetype))) {
if (SG(sapi_headers).mimetype
&& MBSTRG(http_output_conv_mimetypes)
&& _php_mb_match_regex(MBSTRG(http_output_conv_mimetypes), SG(sapi_headers).mimetype, strlen(SG(sapi_headers).mimetype))) {
char *s;
if ((s = strchr(SG(sapi_headers).mimetype, ';')) == NULL) {
mimetype = estrdup(SG(sapi_headers).mimetype);
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16 changes: 16 additions & 0 deletions ext/mbstring/tests/gh17989.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,16 @@
--TEST--
GH-17989 (mb_output_handler crash with unset http_output_conv_mimetypes)
--EXTENSIONS--
mbstring
--INI--
mbstring.http_output_conv_mimetypes=
--FILE--
<?php
echo "set mime type via this echo\n";
ob_start('mb_output_handler');
echo "hi";
ob_flush();
?>
--EXPECT--
set mime type via this echo
hi
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