shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-08 03:40:35 +09:00
Code Issues Packages Projects Releases Wiki Activity

staging: ion: Fix possible null pointer dereference

Browse Source 
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 Colin Cross
parent d232ba2bea
commit 60e11dfc00
1 changed files with 6 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/staging/android/ion/ion_system_heap.c
View File

@@ -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;
}