PVS-Studio warning V579 for ReactOS

static const PCHAR Nv11Board = "NV11 (GeForce2) Board";
static const PCHAR Nv11Chip = "Chip Rev B2";
static const PCHAR Nv11Vendor = "NVidia Corporation";

BOOLEAN
IsVesaBiosOk(....)
{
  ...
  if (!(strncmp(Vendor, Nv11Vendor, sizeof(Nv11Vendor))) &&
      !(strncmp(Product, Nv11Board, sizeof(Nv11Board))) &&
      !(strncmp(Revision, Nv11Chip, sizeof(Nv11Chip))) &&
      (OemRevision == 0x311))
  ...
}

The error is this: sizeof() returns the pointer size, not string length.


This suspicious code was found in ReactOS project by PVS-Studio static code analyzer.
Warning message is:
V579 The strncmp function receives the pointer and its size as arguments. It is possibly a mistake. Inspect the third argument. vga vbe.c 57

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/