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[2007-12-09 01:01 UTC] sfox@php.net
Description: ------------ If the length argument fed to array_slice() isn't of PHP type integer, array_slice() fails silently. This was broken during Jani's major backporting session from CVS HEAD on Nov 2nd (i.e. it looks like HEAD's broken this way too). In the 5_2 branch there's a less clean API but the Z_LVAL_P is explicitly converted to long. http://cvs.php.net/viewvc.cgi/php-src/ext/standard/array.c?r1=1.308.2.21.2.37.2.5&r2=1.308.2.21.2.37.2.6&pathrev=PHP_5_3 I've a trivial fix for it that involves making the zval length parameter a long. It's impossible to tell from the test suite whether this breaks anything that wasn't broken before (looking at how it's used, I can't see how it could.) Patch should apply cleanly to HEAD also, apart from the length initialization (already exists in HEAD but not in 5_3). Reproduce code: --------------- Basic, but illustrates the problem: <?php $arr = array(1, 2, 3, 4, 5, 6); var_dump(array_slice($arr, 0, (float)2)); var_dump(array_slice($arr, 0, (int)2)); ?> Expected result: ---------------- array(2) { [0]=> int(1) [1]=> int(2) } array(2) { [0]=> int(1) [1]=> int(2) } Actual result: -------------- array(0) { } array(2) { [0]=> int(1) [1]=> int(2) } PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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Last updated: Mon Apr 28 17:01:33 2025 UTC |
Forgot to post patch. (Is there no way to upload files?) Index: ext/standard/array.c =================================================================== RCS file: /repository/php-src/ext/standard/array.c,v retrieving revision 1.308.2.21.2.37.2.11 diff -u -r1.308.2.21.2.37.2.11 array.c --- ext/standard/array.c 5 Dec 2007 19:55:31 -0000 1.308.2.21.2.37.2.11 +++ ext/standard/array.c 8 Dec 2007 23:10:28 -0000 @@ -2101,17 +2101,16 @@ zval *input, /* Input array */ **entry; /* An array entry */ long offset, /* Offset to get elements from */ - length; /* How many elements to get */ + length = 0; /* How many elements to get */ zend_bool preserve_keys = 0; /* Whether to preserve keys while copying to the new array or not */ int num_in, /* Number of elements in the input array */ pos; /* Current position in the array */ - zval *length_param; char *string_key; uint string_key_len; ulong num_key; HashPosition hpos; - if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "al|zb", &input, &offset, &length_param, &preserve_keys) == FAILURE) { + if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "al|lb", &input, &offset, &length, &preserve_keys) == FAILURE) { return; } @@ -2119,9 +2118,7 @@ num_in = zend_hash_num_elements(Z_ARRVAL_P(input)); /* We want all entries from offset to the end if length is not passed or is null */ - if (ZEND_NUM_ARGS() >= 3 && Z_TYPE_P(length_param) != IS_NULL) { - length = Z_LVAL_P(length_param); - } else { + if (!ZEND_NUM_ARGS() >= 3 || length == IS_NULL) { length = num_in; }It's just not my day. Index: ext/standard/array.c =================================================================== RCS file: /repository/php-src/ext/standard/array.c,v retrieving revision 1.308.2.21.2.37.2.11 diff -u -r1.308.2.21.2.37.2.11 array.c --- ext/standard/array.c 5 Dec 2007 19:55:31 -0000 1.308.2.21.2.37.2.11 +++ ext/standard/array.c 9 Dec 2007 23:07:13 -0000 @@ -2120,6 +2120,7 @@ /* We want all entries from offset to the end if length is not passed or is null */ if (ZEND_NUM_ARGS() >= 3 && Z_TYPE_P(length_param) != IS_NULL) { + convert_to_long_ex(&length_param); length = Z_LVAL_P(length_param); } else { length = num_in;Adding this for the sake of completeness, just in case there's a decision taken to dump the zval. Index: ext/standard/array.c =================================================================== RCS file: /repository/php-src/ext/standard/array.c,v retrieving revision 1.308.2.21.2.37.2.11 diff -u -r1.308.2.21.2.37.2.11 array.c --- ext/standard/array.c 5 Dec 2007 19:55:31 -0000 1.308.2.21.2.37.2.11 +++ ext/standard/array.c 10 Dec 2007 20:31:35 -0000 @@ -2101,17 +2101,16 @@ zval *input, /* Input array */ **entry; /* An array entry */ long offset, /* Offset to get elements from */ - length; /* How many elements to get */ + length = 0; /* How many elements to get */ zend_bool preserve_keys = 0; /* Whether to preserve keys while copying to the new array or not */ int num_in, /* Number of elements in the input array */ pos; /* Current position in the array */ - zval *length_param; char *string_key; uint string_key_len; ulong num_key; HashPosition hpos; - if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "al|zb", &input, &offset, &length_param, &preserve_keys) == FAILURE) { + if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "al|lb", &input, &offset, &length, &preserve_keys) == FAILURE) { return; } @@ -2119,9 +2118,7 @@ num_in = zend_hash_num_elements(Z_ARRVAL_P(input)); /* We want all entries from offset to the end if length is not passed or is null */ - if (ZEND_NUM_ARGS() >= 3 && Z_TYPE_P(length_param) != IS_NULL) { - length = Z_LVAL_P(length_param); - } else { + if (length == 0) { length = num_in; }