If you open /dev/ram7 when the kernel is configured for 4 ramdisks, things
blow up.  Teach rd_open() to check that the minor is in range.


 drivers/block/rd.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletion(-)

diff -puN drivers/block/rd.c~rd-range-check drivers/block/rd.c
--- 25/drivers/block/rd.c~rd-range-check	2003-06-17 09:36:38.000000000 -0700
+++ 25-akpm/drivers/block/rd.c	2003-06-17 09:38:02.000000000 -0700
@@ -269,7 +269,10 @@ static struct backing_dev_info rd_backin
 
 static int rd_open(struct inode * inode, struct file * filp)
 {
-	int unit = minor(inode->i_rdev);
+	unsigned unit = minor(inode->i_rdev);
+
+	if (unit >= NUM_RAMDISKS)
+		return -ENODEV;
 
 	/*
 	 * Immunize device against invalidate_buffers() and prune_icache().

_