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gpu: nvgpu: Fix overflow of alloc length

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Fix an issue where large ( > 4GB) allocations were not being computed
correctly. The two fields, pages and page_size, were both 32 bits so
when multiplied they easily overflowed. Simple fix is to cast them to
64 bits before multiplying them.

Change-Id: I63fa54679e485de5c3a99684cbeb72c6cdc65504
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: http://git-master/r/747429
Reviewed-by: Sami Kiminki <skiminki@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/771148
Reviewed-by: Yu-Huan Hsu <yhsu@nvidia.com>
This commit is contained in:
Alex Waterman
2015-05-26 15:15:56 -07:00
parent e60b7deec4
commit 4a3f84d257
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/nvgpu/gk20a/mm_gk20a.c
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@@ -2816,7 +2816,9 @@ int gk20a_vm_alloc_space(struct gk20a_as_share *as_share,
(u64)args->pages *
(u64)args->page_size);
else
vaddr_start = gk20a_balloc(vma, args->pages * args->page_size);
vaddr_start = gk20a_balloc(vma,
(u64)args->pages *
(u64)args->page_size);
if (!vaddr_start) {
kfree(va_node);