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...re is no need to have physically contiguous memory, this patch switches kcalloc() to kvcalloc() in order to avoid failing allocations. Fixes: 249881232e14 ("nouveau/dmem: evict device private memory during release") Suggested-by: Danilo Krummrich <dakr at redhat.com> Signed-off-by: Duoming Zhou <duoming at zju.edu.cn> --- Changes in v3: - Switch kcalloc() to kvcalloc(). drivers/gpu/drm/nouveau/nouveau_dmem.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c index 1...

On Sun, Mar 3, 2024 at 4:46?AM Duoming Zhou <duoming at zju.edu.cn> wrote: > > The kcalloc() in nouveau_dmem_evict_chunk() will return null if > the physical memory has run out. As a result, if we dereference > src_pfns, dst_pfns or dma_addrs, the null pointer dereference bugs > will happen. > > This patch use...

...al memory has run out. As a result, if we dereference src_pfns, dst_pfns or dma_addrs, the null pointer dereference bugs will happen. This patch uses stack variables to replace the kcalloc(). Fixes: 249881232e14 ("nouveau/dmem: evict device private memory during release") Signed-off-by: Duoming Zhou <duoming at zju.edu.cn> --- drivers/gpu/drm/nouveau/nouveau_dmem.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c index 12feecf71e7..9a578262c6d 100644 --- a/drivers/gpu/dr...

On 3/6/24 06:01, Duoming Zhou wrote: > The kcalloc() in nouveau_dmem_evict_chunk() will return null if > the physical memory has run out. As a result, if we dereference > src_pfns, dst_pfns or dma_addrs, the null pointer dereference bugs > will happen. > > Moreover, the GPU is going away. If the kcalloc(...