direct-io: fix error-path crashes
commit6a648fa72161d1f6468dabd96c5d3c0db04f598a
authorBadari Pulavarty <pbadari@us.ibm.com>
Fri, 10 Aug 2007 20:00:44 +0000 (10 13:00 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Sat, 11 Aug 2007 22:47:40 +0000 (11 15:47 -0700)
treeb39d233a05c5373240c31b38ac23802438a7486b
parentb291aa7a6564e859af144e1bd14ffa463519b198
direct-io: fix error-path crashes

Need to initialize map_bh.b_state to zero.  Otherwise, in case of a faulty
user-buffer its possible to go into dio_zero_block() and submit a page by
mistake - since it checks for buffer_new().

http://marc.info/?l=linux-kernel&m=118551339032528&w=2

akpm: Linus had a (better) patch to just do a kzalloc() in there, but it got
lost.  Probably this version is better for -stable anwyay.

Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Acked-by: Joe Jin <joe.jin@oracle.com>
Acked-by: Zach Brown <zach.brown@oracle.com>
Cc: gurudas pai <gurudas.pai@oracle.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/direct-io.c