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android: binder: Fix null ptr dereference in debug msg 

Don't access next->data in kernel debug message when the
next buffer is null.

Acked-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Sherry Yang <sherryy@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sherry Yang 2017-10-20 20:58:59 -04:00 committed by Greg Kroah-Hartman
parent a0c2baaf81
commit ae65c8510f
1 changed files with 1 additions and 1 deletions
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2
drivers/android/binder_alloc.c
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@ -560,7 +560,7 @@ static void binder_delete_free_buffer(struct binder_alloc *alloc,
binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC,
"%d: merge free, buffer %pK do not share page with %pK or %pK\n",
alloc->pid, buffer->data,
prev->data, next->data);
prev->data, next ? next->data : NULL);
binder_update_page_range(alloc, 0, buffer_start_page(buffer),
buffer_start_page(buffer) + PAGE_SIZE,
NULL);