Re: [PATCH] drm/amdkfd: fix freeing an unset pointer

Felix Kuehling
2022-02-09T20:34:56Z

On 2022-02-09 09:52, trix@redhat.com wrote:
> From: Tom Rix <trix@redhat.com>
>
> clang static analysis reports this problem
> kfd_chardev.c:2092:2: warning: 1st function call argument
> is an uninitialized value
> kvfree(bo_privs);
> ^~~~~~~~~~~~~~~~
>
> When bo_buckets alloc fails, it jumps to an error handler
> that frees the yet to be allocated bo_privs. Because
> bo_buckets is the first error, return directly.
>
> Fixes: 5ccbb057c0a1 ("drm/amdkfd: CRIU Implement KFD checkpoint ioctl")

Thank you, Tom. I'm applying your patch to amd-staging-drm-next.

Regards,
Felix

>
> Signed-off-by: Tom Rix <trix@redhat.com>
> ---
> drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> index 64e3b4e3a7126..636391c61cafb 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> @@ -1982,10 +1982,8 @@ static int criu_checkpoint_bos(struct kfd_process *p,
> void *mem;
>
> bo_buckets = kvzalloc(num_bos * sizeof(*bo_buckets), GFP_KERNEL);
> - if (!bo_buckets) {
> - ret = -ENOMEM;
> - goto exit;
> - }
> + if (!bo_buckets)
> + return -ENOMEM;
>
> bo_privs = kvzalloc(num_bos * sizeof(*bo_privs), GFP_KERNEL);
> if (!bo_privs) {