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Diffstat (limited to 'phpdbg_prompt.c')
-rw-r--r--phpdbg_prompt.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/phpdbg_prompt.c b/phpdbg_prompt.c
index 679f52f95b..eff36f4253 100644
--- a/phpdbg_prompt.c
+++ b/phpdbg_prompt.c
@@ -668,6 +668,10 @@ PHPDBG_COMMAND(back) /* {{{ */
zval **file, **line, **funcname, **class, **type, **args;
char is_class;
+ if (limit < 0) {
+ phpdbg_error("Invalid backtrace size %d", limit);
+ }
+
zend_fetch_debug_backtrace(
&zbacktrace, 0, 0, limit TSRMLS_CC);