ext/gd: imagecrop rect argument overflow fixes. #18006
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devnexen
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Mar 9, 2025
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| @@ -3560,6 +3560,26 @@ PHP_FUNCTION(imagecrop) | |||
| RETURN_THROWS(); | |||
| } | |||
|
|
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| if ((rect.width > 0 && rect.x > INT_MAX - rect.width)) { | |||
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I think we need to check already when assigning to the members of gdRect (which are ints) above.
And I'm not sure whether allowing negative values makes any sense; from a quick glance, that would be treated like zero. Maybe still support that for 8.3+, but additionally throw for master.
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I did some work on master prior, counting on this one before going further.
ext/gd/tests/imagecrop_overflow.phpt
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| imagecrop() overflows when the combo x/width or y/height is over INT_MAX or | ||
| under INT_MIN. |
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Please use a single line (see https://qa.php.net/phpt_details.php#test_section).
```
ext/gd/libgd/gd.c:2275:14: runtime error: signed integer overflow: 2147483647 + 1 cannot be represented in type 'int'
#0 0x5d6a2103e1db in php_gd_gdImageCopy /home/dcarlier/Contribs/php-src/ext/gd/libgd/gd.c:2275
#1 0x5d6a210a2b63 in gdImageCrop /home/dcarlier/Contribs/php-src/ext/gd/libgd/gd_crop.c:57
php#2 0x5d6a21018ca4 in zif_imagecrop /home/dcarlier/Contribs/php-src/ext/gd/gd.c:3575
php#3 0x5d6a21e46e7a in ZEND_DO_ICALL_SPEC_RETVAL_USED_HANDLER /home/dcarlier/Contribs/php-src/Zend/zend_vm_execute.h:1337
php#4 0x5d6a221188da in execute_ex /home/dcarlier/Contribs/php-src/Zend/zend_vm_execute.h:57246
php#5 0x5d6a221366bd in zend_execute /home/dcarlier/Contribs/php-src/Zend/zend_vm_execute.h:61634
php#6 0x5d6a21d107a6 in zend_execute_scripts /home/dcarlier/Contribs/php-src/Zend/zend.c:1895
php#7 0x5d6a21a63409 in php_execute_script /home/dcarlier/Contribs/php-src/main/main.c:2529
php#8 0x5d6a22516d5e in do_cli /home/dcarlier/Contribs/php-src/sapi/cli/php_cli.c:966
php#9 0x5d6a2251981d in main /home/dcarlier/Contribs/php-src/sapi/cli/php_cli.c:1341
php#10 0x7f10d002a3b7 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
php#11 0x7f10d002a47a in __libc_start_main_impl ../csu/libc-start.c:360
php#12 0x5d6a20a06da4 in _start (/home/dcarlier/Contribs/php-src/sapi/cli/php+0x2806da4) (BuildId: d9a79c7e0e4872311439d7313cb3a81fe04190a2)
```
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