This is a note to let you know that I've just added the patch titled
drm/msm/a6xx: Fix kvzalloc vs state_kcalloc usage
to the 6.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-msm-a6xx-fix-kvzalloc-vs-state_kcalloc-usage.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5af5ddbb85e2d04911cf19f61ab5e0ab0a2d4146
Author: Rob Clark <robdclark@xxxxxxxxxxxx>
Date: Thu Oct 13 15:55:13 2022 -0700
drm/msm/a6xx: Fix kvzalloc vs state_kcalloc usage
[ Upstream commit 83d18e9d9c0150d98dc24e3642ea93f5e245322c ]
adreno_show_object() is a trap! It will re-allocate the pointer it is
passed on first call, when the data is ascii85 encoded, using kvmalloc/
kvfree(). Which means the data *passed* to it must be kvmalloc'd, ie.
we cannot use the state_kcalloc() helper.
This partially reverts commit ec8f1813bf8d ("drm/msm/a6xx: Replace
kcalloc() with kvzalloc()"), but adds the missing kvfree() to fix the
memory leak that was present previously. And adds a warning comment.
Fixes: ec8f1813bf8d ("drm/msm/a6xx: Replace kcalloc() with kvzalloc()")
Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/20
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
Reviewed-by: Chia-I Wu <olvaffe@xxxxxxxxx>
Reviewed-by: Akhil P Oommen <quic_akhilpo@xxxxxxxxxxx>
Patchwork: https://patchwork.freedesktop.org/patch/507014/
Link: https://lore.kernel.org/r/20221013225520.371226-2-robdclark@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
index 3c112a6cc8a2..730355f9e2d4 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
@@ -819,7 +819,7 @@ static struct msm_gpu_state_bo *a6xx_snapshot_gmu_bo(
snapshot->iova = bo->iova;
snapshot->size = bo->size;
- snapshot->data = state_kcalloc(a6xx_state, 1, snapshot->size);
+ snapshot->data = kvzalloc(snapshot->size, GFP_KERNEL);
if (!snapshot->data)
return NULL;
@@ -1034,6 +1034,15 @@ static void a6xx_gpu_state_destroy(struct kref *kref)
struct a6xx_gpu_state *a6xx_state = container_of(state,
struct a6xx_gpu_state, base);
+ if (a6xx_state->gmu_log)
+ kvfree(a6xx_state->gmu_log->data);
+
+ if (a6xx_state->gmu_hfi)
+ kvfree(a6xx_state->gmu_hfi->data);
+
+ if (a6xx_state->gmu_debug)
+ kvfree(a6xx_state->gmu_debug->data);
+
list_for_each_entry_safe(obj, tmp, &a6xx_state->objs, node)
kvfree(obj);
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 382fb7f9e497..5a0e8491cd3a 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -729,7 +729,12 @@ static char *adreno_gpu_ascii85_encode(u32 *src, size_t len)
return buf;
}
-/* len is expected to be in bytes */
+/* len is expected to be in bytes
+ *
+ * WARNING: *ptr should be allocated with kvmalloc or friends. It can be free'd
+ * with kvfree() and replaced with a newly kvmalloc'd buffer on the first call
+ * when the unencoded raw data is encoded
+ */
void adreno_show_object(struct drm_printer *p, void **ptr, int len,
bool *encoded)
{
