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gpu: nvgpu: add check for "vm->num_user_mapped_buffers"

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The "nvgpu_big_zalloc()" will be failed if the passed-in argument
"vm->num_user_mapped_buffers" is zero. The returned value is 16
which will bypass the NULL-check and then causes the panic.

This patch adds a check on the "vm->num_user_mapped_buffers" to
avoid the zero is passed-in the "nvgpu_big_zalloc()".

Bug 2603292

Change-Id: I399eecf72a288e13992730651a34a6cea1ef56d1
Signed-off-by: Kary Jin <karyj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2123499
(cherry picked from commit fea9e05454)
Reviewed-on: https://git-master.nvidia.com/r/2130001
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Kary Jin
2019-05-22 17:10:47 +08:00
committed by mobile promotions
parent 5943f5fc9d
commit 03db4f8f33
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/nvgpu/common/mm/vm.c
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@@ -896,6 +896,11 @@ int nvgpu_vm_get_buffers(struct vm_gk20a *vm,
nvgpu_mutex_acquire(&vm->update_gmmu_lock); nvgpu_mutex_acquire(&vm->update_gmmu_lock);
if (vm->num_user_mapped_buffers == 0U) {
nvgpu_mutex_release(&vm->update_gmmu_lock);
return 0;
}
buffer_list = nvgpu_big_zalloc(vm->mm->g, buffer_list = nvgpu_big_zalloc(vm->mm->g,
nvgpu_safe_mult_u64(sizeof(*buffer_list), nvgpu_safe_mult_u64(sizeof(*buffer_list),
vm->num_user_mapped_buffers)); vm->num_user_mapped_buffers));