[php-maint] Bug#570287: [debian/debian-sid] Fix improper signed overflow detection in filter extension

Sean Finney seanius at debian.org
Thu Feb 25 21:42:20 UTC 2010

tag 570287 pending

Date: Thu Feb 25 22:02:52 2010 +0100
Author: Sean Finney <seanius at debian.org>
Commit ID: 3061d111de130df7388cc78e26b63cc105574775
Commit URL: http://git.debian.org/?p=pkg-php/php.git;a=commitdiff;h=3061d111de130df7388cc78e26b63cc105574775
Patch URL: http://git.debian.org/?p=pkg-php/php.git;a=commitdiff_plain;h=3061d111de130df7388cc78e26b63cc105574775

    Fix improper signed overflow detection in filter extension

    The existing filter code relied on detecting invalid long integers by
    examining computed values for wraparound.  This is not defined behavior
    in any C standard, and in fact recent versions of gcc will optimize out
    such checks resulting in invalid code.

    This patch therefore changes how the overflow/underflow conditions are
    detected, using more reliable arithmetic.  It also fixes another bug, that
    the minimum integer value (-PHP_INT_MAX)-1 could not be detected properly.

    This patch also includes an update to the test case that detects such
    overflows, adding much more thorough and descriptive checking.

    Closes: #570287

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