[patch 1/6][RFC] Keep FIBMAP from looking at negative block nrs

[Mike Waychison <mikew@google.com>]

[-- Attachment #1: fix_negative_fibmap_blocks.patch --]
[-- Type: text/plain, Size: 665 bytes --]

Return an error if the user requests a negative logical block in a file.

Signed-off-by: Mike Waychison <mikew@google.com>
 fs/ioctl.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6.23/fs/ioctl.c
===================================================================
--- linux-2.6.23.orig/fs/ioctl.c	2007-10-26 15:25:48.000000000 -0700
+++ linux-2.6.23/fs/ioctl.c	2007-10-26 16:16:29.000000000 -0700
@@ -60,6 +60,8 @@ static int file_ioctl(struct file *filp,
 				return -EPERM;
 			if ((error = get_user(block, p)) != 0)
 				return error;
+			if (block < 0)
+				return -EINVAL;
 
 			lock_kernel();
 			res = mapping->a_ops->bmap(mapping, block);

--