From cf7503d8a09ebce695423fdeb2402c456c18f3d8 Mon Sep 17 00:00:00 2001 From: Julian Andres Klode Date: Wed, 31 Aug 2016 17:18:07 +0200 Subject: Base256ToNum: Fix uninitialized value If the inner Base256ToNum() returned false, it did not set Num to a new value, causing it to be uninitialized, and thus might have caused the function to exit despite a good result. Also document why the Res = Num, if (Res != Num) magic is done. Reported-By: valgrind --- apt-pkg/contrib/strutl.cc | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/apt-pkg/contrib/strutl.cc b/apt-pkg/contrib/strutl.cc index 66b0078dc..cf8feb970 100644 --- a/apt-pkg/contrib/strutl.cc +++ b/apt-pkg/contrib/strutl.cc @@ -1171,10 +1171,11 @@ bool Base256ToNum(const char *Str,unsigned long long &Res,unsigned int Len) tar files */ bool Base256ToNum(const char *Str,unsigned long &Res,unsigned int Len) { - unsigned long long Num; + unsigned long long Num = 0; bool rc; rc = Base256ToNum(Str, Num, Len); + // rudimentary check for overflow (Res = ulong, Num = ulonglong) Res = Num; if (Res != Num) return false; -- cgit v1.2.3