Don't allocate objects of 0 length

[openafs.git] / src / tools / dumpscan / dumptool.c

diff --git a/src/tools/dumpscan/dumptool.c b/src/tools/dumpscan/dumptool.c
index 6f6e44f..a8c05a0 100644 (file)
--- a/src/tools/dumpscan/dumptool.c
+++ b/src/tools/dumpscan/dumptool.c
@@ -1149,12 +1149,19 @@ ScanVnodes(FILE * f, VolumeDiskData * vol, int sizescan)
        numSmallVnodes = numFileVnodes;
 
     } else {
-       LargeVnodeIndex = (struct vnodeData **)
-           malloc(numDirVnodes * sizeof(struct vnodeData));
-       SmallVnodeIndex = (struct vnodeData **)
-           malloc(numFileVnodes * sizeof(struct vnodeData));
+       if (numDirVnodes == 0)
+           LargeVnodeIndex = NULL;
+       else
+           LargeVnodeIndex = malloc(numDirVnodes
+                                     * sizeof(struct vnodeData *));
+       if (numFileVnodes == 0)
+           SmallVnodeIndex = NULL;
+       else
+           SmallVnodeIndex = malloc(numFileVnodes
+                                     * sizeof(struct vnodeData *));
 
-       if (LargeVnodeIndex == NULL || SmallVnodeIndex == NULL) {
+       if ((numDirVnodes != 0 && LargeVnodeIndex == NULL) ||
+           (numFileVnodes != 0 && SmallVnodeIndex == NULL)) {
            if (verbose)
                fprintf(stderr,
                        "Unable to allocate space " "for vnode tables\n");