check reallocf() result for failures

git-svn-id: https://smartmontools.svn.sourceforge.net/svnroot/smartmontools/trunk@3008 4ea69e1a-61f1-4043-bf83-b5c94c648137

smartmontools/CHANGELOG

@@ -43,6 +43,8 @@ NOTES FOR FUTURE RELEASES: see TODO file.
 
 <DEVELOPERS: ADDITIONS TO THE CHANGE LOG GO JUST BELOW HERE, PLEASE>
 
+  [DL] FreeBSD: check reallocf() result for failures
+
   [AS] FreeBSD: fixing crash on kFreeBSD (#29), patch provided by Petr Salinger
 
   [CF] Makefile.am: 'make check' now tests the syntax of drivedb.h.

smartmontools/os_freebsd.cpp

@@ -1535,6 +1535,12 @@ int get_dev_names_ata(char*** names) {
     };
   };  
   mp = (char **)reallocf(mp,n*(sizeof (char*))); // shrink to correct size
+  if (mp == NULL && n > 0 ) { // reallocf never fail for size=0, but may return NULL
+    serrno=errno;
+    pout("Out of memory constructing scan device list (on line %d)\n", __LINE__);
+    n = -1;
+    goto end;
+  };
   bytes += (n)*(sizeof(char*)); // and set allocated byte count
 
 end: