Propagate an error (EFBIG) to userspace if the physical block is too large to return in a 32bit int instead of truncating it.
Signed-off-by: Mike Waychison <[email protected]>
fs/ioctl.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
Index: linux-2.6.23/fs/ioctl.c
===================================================================
--- linux-2.6.23.orig/fs/ioctl.c 2007-10-26 15:26:10.000000000 -0700
+++ linux-2.6.23/fs/ioctl.c 2007-10-26 16:16:28.000000000 -0700
@@ -52,6 +52,7 @@ static int file_ioctl(struct file *filp,
case FIBMAP:
{
struct address_space *mapping = filp->f_mapping;
+ sector_t phys_block;
int res;
/* do we support this mess? */
if (!mapping->a_ops->bmap)
@@ -64,8 +65,15 @@ static int file_ioctl(struct file *filp,
return -EINVAL;
lock_kernel();
- res = mapping->a_ops->bmap(mapping, block);
+ phys_block = mapping->a_ops->bmap(mapping, block);
unlock_kernel();
+
+ /* Make sure that the return value fits in the
+ * user's buffer. */
+ if ((u32)phys_block < phys_block)
+ return -EFBIG;
+
+ res = phys_block;
return put_user(res, p);
}
case FIGETBSZ:
--
-
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