tree c4f7fd8f6a24c5d242dd7bd0a876413f15e26fcd
parent eccd83e116e7f414a1da3aae3745384b7b171883
author Johannes Weiner <hannes@cmpxchg.org> 1231281790 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1231286371 -0800

dma-coherent: catch oversized requests to dma_alloc_from_coherent()

Prevent passing an order to bitmap_find_free_region() that is larger than
the actual bitmap can represent.

These requests can come from device drivers that have no idea how big the
dma region is and need to rely on dma_alloc_from_coherent() to sort it out
for them.

Reported-by: Guennadi Liakhovetski <lg@denx.de>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Dmitry Baryshkov <dbaryshkov@gmail.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>