3 files changed, 5 insertions, 4 deletions
diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index a9d51a6bf..fd13b45dc 100644
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -1908,11 +1908,12 @@ public:
 	       " but was forced to ignore it in favor of an external binary – which isn't installed.", compressor.Name.c_str());
 
       bool const Comp = (Mode & FileFd::WriteOnly) == FileFd::WriteOnly;
-      if (Comp == false)
+      if (Comp == false && filefd->iFd != -1)
       {
 	 // Handle 'decompression' of empty files
 	 struct stat Buf;
-	 fstat(filefd->iFd, &Buf);
+	 if (fstat(filefd->iFd, &Buf) != 0)
+	    return filefd->FileFdErrno("fstat", "Could not stat fd %d for file %s", filefd->iFd, filefd->FileName.c_str());
 	 if (Buf.st_size == 0 && S_ISFIFO(Buf.st_mode) == false)
 	    return true;
 
diff --git a/apt-pkg/contrib/fileutl.h b/apt-pkg/contrib/fileutl.h
index 4a1676dc2..15665f8b5 100644
--- a/apt-pkg/contrib/fileutl.h
+++ b/apt-pkg/contrib/fileutl.h
@@ -164,7 +164,7 @@ bool RemoveFile(char const * const Function, std::string const &FileName);
 int GetLock(std::string File,bool Errors = true);
 bool FileExists(std::string File);
 bool RealFileExists(std::string File);
-bool DirectoryExists(std::string const &Path) APT_CONST;
+bool DirectoryExists(std::string const &Path);
 bool CreateDirectory(std::string const &Parent, std::string const &Path);
 time_t GetModificationTime(std::string const &Path);
 bool Rename(std::string From, std::string To);
diff --git a/apt-pkg/contrib/srvrec.cc b/apt-pkg/contrib/srvrec.cc
index be159bad9..327e59937 100644
--- a/apt-pkg/contrib/srvrec.cc
+++ b/apt-pkg/contrib/srvrec.cc
@@ -185,7 +185,7 @@ SrvRec PopFromSrvRecs(std::vector<SrvRec> &Recs)
 	 [&I](SrvRec const &J) { return I->priority != J.priority; });
 
    // clock seems random enough.
-   I += clock() % std::distance(I, J);
+   I += std::max(static_cast<clock_t>(0), clock()) % std::distance(I, J);
    SrvRec const selected = std::move(*I);
    Recs.erase(I);