mm/cma.c: fix NULL pointer dereference when cma could not be activated

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In some case the cma area could not be activated, but the cma_alloc be
used under this case, then the kernel will crash caused by NULL pointer
dereference.

Add bitmap valid check in cma_alloc to avoid this issue.

Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: http://lkml.kernel.org/r/20200615010123.15596-1-jay.xu@rock-chips.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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Jianqun Xu 2020-08-11 18:31:54 -07:00 • committed by Linus Torvalds

parent 1a5bae25e3

commit 835832ba01

1 changed files with 1 additions and 1 deletions

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mm/cma.c

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