vmstat: Replace memcmp() with strncmp().

Otherwise this may read out-of-bounds (there is no guarantee that 5
bytes are actually available at partition/optarg).

diff --git a/vmstat.c b/vmstat.c
index 6eca2c452cf6cc6a94aa4af70a4cee36a3a73c2c..c5f6d62c22245fb302887bc3ef5718022f147fc9 100644 (file)
--- a/vmstat.c
+++ b/vmstat.c
@@ -909,7 +909,7 @@ int main(int argc, char *argv[])
                case 'p':
                        statMode |= PARTITIONSTAT;
                        partition = optarg;
-                       if (memcmp(partition, "/dev/", 5) == 0)
+                       if (strncmp(partition, "/dev/", 5) == 0)
                                partition += 5;
                        break;
                case 'S':