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staging: ion: Fix possible null pointer dereference 

The kbuild test robot reported:

drivers/staging/android/ion/ion_system_heap.c:122 alloc_largest_available() error: potential null dereference 'info'.  (kmalloc returns null)

Where the pointer returned from kmalloc goes unchecked for failure.

This patch checks the return for NULL, and reworks the logic, as
suggested by Colin, so we allocate the page_info structure first.

Acked-by: Colin Cross <ccross@android.com>
Cc: Android Kernel Team <kernel-team@android.com>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
John Stultz 2013-12-16 21:07:52 -08:00 committed by Greg Kroah-Hartman
parent 679bcc935c
commit f4ea823be2
1 changed files with 6 additions and 1 deletions
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7
drivers/staging/android/ion/ion_system_heap.c
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@ -108,6 +108,10 @@ static struct page_info *alloc_largest_available(struct ion_system_heap *heap,
struct page_info *info;
int i;
info = kmalloc(sizeof(struct page_info), GFP_KERNEL);
if (!info)
return NULL;
for (i = 0; i < num_orders; i++) {
if (size < order_to_size(orders[i]))
continue;
@ -118,11 +122,12 @@ static struct page_info *alloc_largest_available(struct ion_system_heap *heap,
if (!page)
continue;
info = kmalloc(sizeof(struct page_info), GFP_KERNEL);
info->page = page;
info->order = orders[i];
return info;
}
kfree(info);
return NULL;
}