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Fix GH-15552: Signed integer overflow in ext/standard/scanf.c #15581

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Fix GH-15552: Signed integer overflow in ext/standard/scanf.c #15581

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4 changes: 2 additions & 2 deletions ext/standard/scanf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -361,8 +361,7 @@ PHPAPI int ValidateFormat(char *format, int numVars, int *totalSubs)
if (gotSequential) {
goto mixedXPG;
}
objIndex = value - 1;
if ((objIndex < 0) || (numVars && (objIndex >= numVars))) {
if ((value < 1) || (numVars && (value > numVars))) {
goto badIndex;
} else if (numVars == 0) {
/*
Expand All @@ -382,6 +381,7 @@ PHPAPI int ValidateFormat(char *format, int numVars, int *totalSubs)

xpgSize = (xpgSize > value) ? xpgSize : value;
}
objIndex = value - 1;
goto xpgCheckDone;
}

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9 changes: 9 additions & 0 deletions ext/standard/tests/strings/gh15552.phpt
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@@ -0,0 +1,9 @@
--TEST--
Bug GH-15552 (Signed integer overflow in ext/standard/scanf.c)
--FILE--
<?php
var_dump(sscanf('hello','%2147483648$s'));
?>
--EXPECTF--
Fatal error: Uncaught ValueError: "%n$" argument index out of range in %s:%d
Stack trace:%A
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