vfs: make AIO use the proper rw_verify_area() area helpers
authorLinus Torvalds <torvalds@linux-foundation.org>
Mon, 21 May 2012 23:06:20 +0000 (16:06 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 1 Jun 2012 07:18:14 +0000 (15:18 +0800)
commit64126fa12b904d5dae0b7e33fac540c46faf67c5
tree3d0d92f25324a19775f6f8949b7c4e35e412454f
parent4e1468e1f16dcd141bb256fd7320687b5b8bc975
vfs: make AIO use the proper rw_verify_area() area helpers

commit a70b52ec1aaeaf60f4739edb1b422827cb6f3893 upstream.

We had for some reason overlooked the AIO interface, and it didn't use
the proper rw_verify_area() helper function that checks (for example)
mandatory locking on the file, and that the size of the access doesn't
cause us to overflow the provided offset limits etc.

Instead, AIO did just the security_file_permission() thing (that
rw_verify_area() also does) directly.

This fixes it to do all the proper helper functions, which not only
means that now mandatory file locking works with AIO too, we can
actually remove lines of code.

Reported-by: Manish Honap <manish_honap_vit@yahoo.co.in>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/aio.c