Linaro-mm-sig April 2026

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[PATCH 15901/15901] drm/vmwgfx: fix NULL pointer dereference in vmw_validation_bo_fence()

by popov.nkv＠gmail.com

From: Vladimir Popov <popov.nkv(a)gmail.com> If vmw_execbuf_fence_commands() call fails in vmw_kms_helper_validation_finish(), it sets *p_fence = NULL. If ctx->bo_list is not empty, the caller, vmw_kms_helper_validation_finish(), passes the fence through a chain of functions to dma_fence_is_array(), which causes a NULL pointer dereference in dma_fence_is_array(): vmw_kms_helper_validation_finish() // pass NULL fence vmw_validation_done() vmw_validation_bo_fence() ttm_eu_fence_buffer_objects() // pass NULL fence dma_resv_add_fence() dma_fence_is_container() dma_fence_is_array() // NULL deref Fix this by adding a NULL check in vmw_validation_bo_fence(): if the fence is NULL, fall back to ttm_eu_backoff_reservation()to safely release the buffer object reservations without attempting to add a NULL fence to dma_resv. This is safe because when fence is NULL, vmw_fallback_wait() has already been called inside vmw_execbuf_fence_commands() to synchronize the GPU. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 038ecc503236 ("drm/vmwgfx: Add a validation module v2") Cc: stable(a)vger.kernel.org Signed-off-by: Vladimir Popov <popov.nkv(a)gmail.com> --- drivers/gpu/drm/vmwgfx/vmwgfx_validation.h | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h b/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h index 353d837907d8..fc04555ca505 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h @@ -127,16 +127,23 @@ vmw_validation_bo_reserve(struct vmw_validation_context *ctx, * vmw_validation_bo_fence - Unreserve and fence buffer objects registered * with a validation context * @ctx: The validation context + * @fence: Fence with which to fence all buffer objects taking part in the + * command submission. * * This function unreserves the buffer objects previously reserved using - * vmw_validation_bo_reserve, and fences them with a fence object. + * vmw_validation_bo_reserve, and fences them with a fence object if the + * given fence object is not NULL. */ static inline void vmw_validation_bo_fence(struct vmw_validation_context *ctx, struct vmw_fence_obj *fence) { - ttm_eu_fence_buffer_objects(&ctx->ticket, &ctx->bo_list, - (void *) fence); + /* fence is able to be NULL if vmw_execbuf_fence_commands() fails */ + if (fence) + ttm_eu_fence_buffer_objects(&ctx->ticket, &ctx->bo_list, + (void *)fence); + else + ttm_eu_backoff_reservation(&ctx->ticket, &ctx->bo_list); } /** -- 2.43.0

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by Alex Morgan

5 months

[PATCH 1/2] dma-fence: Silence sparse warning in dma_fence_describe

by Tvrtko Ursulin

Sparse complains about assigning a string to a __rcu annotated local variable: drivers/dma-buf/dma-fence.c:1040:38: warning: incorrect type in initializer (different address spaces) drivers/dma-buf/dma-fence.c:1040:38: expected char const [noderef] __rcu *timeline drivers/dma-buf/dma-fence.c:1040:38: got char * drivers/dma-buf/dma-fence.c:1041:36: warning: incorrect type in initializer (different address spaces) drivers/dma-buf/dma-fence.c:1041:36: expected char const [noderef] __rcu *driver drivers/dma-buf/dma-fence.c:1041:36: got char * It is harmless but lets silence it. Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Fixes: ac364014fd81 ("dma-buf: cleanup dma_fence_describe v3") Cc: Christian König <christian.koenig(a)amd.com> Cc: linux-media(a)vger.kernel.org Cc: dri-devel(a)lists.freedesktop.org Cc: linaro-mm-sig(a)lists.linaro.org --- drivers/dma-buf/dma-fence.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c index 1826ba73094c..a2aa82f4eedd 100644 --- a/drivers/dma-buf/dma-fence.c +++ b/drivers/dma-buf/dma-fence.c @@ -1037,8 +1037,8 @@ EXPORT_SYMBOL(dma_fence_set_deadline); */ void dma_fence_describe(struct dma_fence *fence, struct seq_file *seq) { - const char __rcu *timeline = ""; - const char __rcu *driver = ""; + const char __rcu *timeline = (const char __rcu *)""; + const char __rcu *driver = (const char __rcu *)""; const char *signaled = ""; rcu_read_lock(); -- 2.52.0

5 months

[PATCH 1/2] dma-fence: Silence sparse warning in dma_fence_describe

by Tvrtko Ursulin

Sparse complains about assigning a string to a __rcu annotated local variable: drivers/dma-buf/dma-fence.c:1040:38: warning: incorrect type in initializer (different address spaces) drivers/dma-buf/dma-fence.c:1040:38: expected char const [noderef] __rcu *timeline drivers/dma-buf/dma-fence.c:1040:38: got char * drivers/dma-buf/dma-fence.c:1041:36: warning: incorrect type in initializer (different address spaces) drivers/dma-buf/dma-fence.c:1041:36: expected char const [noderef] __rcu *driver drivers/dma-buf/dma-fence.c:1041:36: got char * It is harmless but lets silence it. Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com> Fixes: ac364014fd81 ("dma-buf: cleanup dma_fence_describe v3") Cc: Christian König <christian.koenig(a)amd.com> Cc: linux-media(a)vger.kernel.org Cc: dri-devel(a)lists.freedesktop.org Cc: linaro-mm-sig(a)lists.linaro.org Reviewed-by: Christian König <christian.koenig(a)amd.com> --- drivers/dma-buf/dma-fence.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c index 1826ba73094c..a2aa82f4eedd 100644 --- a/drivers/dma-buf/dma-fence.c +++ b/drivers/dma-buf/dma-fence.c @@ -1037,8 +1037,8 @@ EXPORT_SYMBOL(dma_fence_set_deadline); */ void dma_fence_describe(struct dma_fence *fence, struct seq_file *seq) { - const char __rcu *timeline = ""; - const char __rcu *driver = ""; + const char __rcu *timeline = (const char __rcu *)""; + const char __rcu *driver = (const char __rcu *)""; const char *signaled = ""; rcu_read_lock(); -- 2.52.0

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5 months

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Linaro-mm-sig April 2026