This is a note to let you know that I've just added the patch titled
drm/etnaviv: fix reference leak when mmaping imported buffer
to the 6.2-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-etnaviv-fix-reference-leak-when-mmaping-imported-buffer.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 963b2e8c428f79489ceeb058e8314554ec9cbe6f Mon Sep 17 00:00:00 2001
From: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Date: Fri, 24 Feb 2023 18:21:54 +0100
Subject: drm/etnaviv: fix reference leak when mmaping imported buffer
From: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
commit 963b2e8c428f79489ceeb058e8314554ec9cbe6f upstream.
drm_gem_prime_mmap() takes a reference on the GEM object, but before that
drm_gem_mmap_obj() already takes a reference, which will be leaked as only
one reference is dropped when the mapping is closed. Drop the extra
reference when dma_buf_mmap() succeeds.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Reviewed-by: Christian Gmeiner <christian.gmeiner@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
@@ -91,7 +91,15 @@ static void *etnaviv_gem_prime_vmap_impl
static int etnaviv_gem_prime_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
struct vm_area_struct *vma)
{
- return dma_buf_mmap(etnaviv_obj->base.dma_buf, vma, 0);
+ int ret;
+
+ ret = dma_buf_mmap(etnaviv_obj->base.dma_buf, vma, 0);
+ if (!ret) {
+ /* Drop the reference acquired by drm_gem_mmap_obj(). */
+ drm_gem_object_put(&etnaviv_obj->base);
+ }
+
+ return ret;
}
static const struct etnaviv_gem_ops etnaviv_gem_prime_ops = {
Patches currently in stable-queue which might be from l.stach@xxxxxxxxxxxxxx are
queue-6.2/drm-etnaviv-fix-reference-leak-when-mmaping-imported-buffer.patch
