drm/msm/gem: fix error handling in msm_ioctl_gem_info_get_metadata()

commit 47cbfe2608314b833ad61a65827d8fb363bc2d2d upstream.

msm_ioctl_gem_info_get_metadata() always returns 0 regardless of
errors. When copy_to_user() fails or the user buffer is too small,
the error code stored in ret is ignored because the function
unconditionally returns 0. This causes userspace to believe the
ioctl succeeded when it did not.

Additionally, kmemdup() can return NULL on allocation failure, but
the return value is not checked. This leads to a NULL pointer
dereference in the subsequent copy_to_user() call.

Add the missing NULL check for kmemdup() and return ret instead of 0.

Note that the SET counterpart (msm_ioctl_gem_info_set_metadata)
correctly returns ret.

Fixes: 9902cb999e4e ("drm/msm/gem: Add metadata")
Cc: stable@vger.kernel.org
Signed-off-by: Yasuaki Torimaru <yasuakitorimaru@gmail.com>
Patchwork: https://patchwork.freedesktop.org/patch/714478/
Message-ID: <20260325114635.383241-1-yasuakitorimaru@gmail.com>
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index e5ab1e28851dfe9c4a494c50677ac448a38fa0c3..195f40e331e5a820d9a785b7ecdc030dccefa8e9 100644 (file)
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -536,6 +536,11 @@ static int msm_ioctl_gem_info_get_metadata(struct drm_gem_object *obj,
        len = msm_obj->metadata_size;
        buf = kmemdup(msm_obj->metadata, len, GFP_KERNEL);
 
+       if (!buf) {
+               msm_gem_unlock(obj);
+               return -ENOMEM;
+       }
+
        msm_gem_unlock(obj);
 
        if (*metadata_size < len) {
@@ -548,7 +553,7 @@ static int msm_ioctl_gem_info_get_metadata(struct drm_gem_object *obj,
 
        kfree(buf);
 
-       return 0;
+       return ret;
 }
 
 static int msm_ioctl_gem_info(struct drm_device *dev, void *data,