From d99854cac4065bc7b337815fb2116269d58dab73 Mon Sep 17 00:00:00 2001 From: David Kalnischkies Date: Mon, 21 Apr 2014 13:26:55 +0200 Subject: handle pkgnames shorter than modifiers The bugreport highlights the problem with an empty package name. We fix this by 'ignoring' these so that it behaves just like "apt-get install". The deeper problem is that modifier strings can be longer than a package name in which case the comparison doesn't make sense, so don't compare then. Was not noticed so far as all modifiers are of length 1, so the only package name shorter than this is in fact the empty package name. Closes: 744940 --- apt-pkg/cacheset.cc | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'apt-pkg/cacheset.cc') diff --git a/apt-pkg/cacheset.cc b/apt-pkg/cacheset.cc index d453a2bfb..2ed6a96da 100644 --- a/apt-pkg/cacheset.cc +++ b/apt-pkg/cacheset.cc @@ -391,6 +391,8 @@ bool VersionContainerInterface::FromModifierCommandLine(unsigned short &modID, CacheSetHelper &helper) { Version select = NEWEST; std::string str = cmdline; + if (unlikely(str.empty() == true)) + return false; bool modifierPresent = false; unsigned short fallback = modID; for (std::list::const_iterator mod = mods.begin(); @@ -400,8 +402,8 @@ bool VersionContainerInterface::FromModifierCommandLine(unsigned short &modID, size_t const alength = strlen(mod->Alias); switch(mod->Pos) { case Modifier::POSTFIX: - if (str.compare(str.length() - alength, alength, - mod->Alias, 0, alength) != 0) + if (str.length() <= alength || + str.compare(str.length() - alength, alength, mod->Alias, 0, alength) != 0) continue; str.erase(str.length() - alength); modID = mod->ID; -- cgit v1.2.3