[PATCH] Kexec on panic vmlinux initrd fix

This is a minor bug fix in kexec to resolve the problem of loading panic
kernel with initrd.

o Problem: Loading a capture kenrel fails if initrd is also being loaded.
  This has been observed for vmlinux image for kexec on panic case.

o This patch fixes the problem. In segment location and size verification
  logic, minor correction has been done. Segment memory end (mend) should be
  mstart + memsz - 1. This one byte offset was source of failure for initrd
  loading which was being loaded at hole boundary.

Signed-off-by: Vivek Goyal <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

kernel/kexec.c

@@ -264,7 +264,7 @@ static int kimage_crash_alloc(struct kimage **rimage, unsigned long entry,
 	for (i = 0; i < nr_segments; i++) {
 		unsigned long mstart, mend;
 		mstart = image->segment[i].mem;
-		mend = mstart + image->segment[i].memsz;
+		mend = mstart + image->segment[i].memsz - 1;
 		/* Ensure we are within the crash kernel limits */
 		if ((mstart < crashk_res.start) || (mend > crashk_res.end))
 			goto out;