6.15-stable review patch. If anyone has any objections, please let me know.
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From: Yuan Chen chenyuan@kylinos.cn
[ Upstream commit 1c8c354098ea9d4376a58c96ae6b65288a6f15d8 ]
Function msm_ioctl_gem_info_set_metadata() now checks for krealloc failure and returns -ENOMEM, avoiding potential NULL pointer dereference. Explicitly avoids __GFP_NOFAIL due to deadlock risks and allocation constraints.
Signed-off-by: Yuan Chen chenyuan@kylinos.cn Patchwork: https://patchwork.freedesktop.org/patch/661235/ Signed-off-by: Rob Clark robin.clark@oss.qualcomm.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/msm/msm_drv.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c index c3588dc9e537..b4e73b015d02 100644 --- a/drivers/gpu/drm/msm/msm_drv.c +++ b/drivers/gpu/drm/msm/msm_drv.c @@ -551,6 +551,7 @@ static int msm_ioctl_gem_info_set_metadata(struct drm_gem_object *obj, u32 metadata_size) { struct msm_gem_object *msm_obj = to_msm_bo(obj); + void *new_metadata; void *buf; int ret;
@@ -568,8 +569,14 @@ static int msm_ioctl_gem_info_set_metadata(struct drm_gem_object *obj, if (ret) goto out;
- msm_obj->metadata = + new_metadata = krealloc(msm_obj->metadata, metadata_size, GFP_KERNEL); + if (!new_metadata) { + ret = -ENOMEM; + goto out; + } + + msm_obj->metadata = new_metadata; msm_obj->metadata_size = metadata_size; memcpy(msm_obj->metadata, buf, metadata_size);