drm: Fix missing unlock and free on error in drm_legacy_addbufs_pci()

Add the missing unlock and free before return from function
drm_legacy_addbufs_pci() in the error handling case.

Fixes: 70556e24e18e ("drm: remove usage of drm_pci_alloc/free")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zou Wei <zou_wei@huawei.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1621341302-112089-1-git-send-email-zou_wei@huawei.com

diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c
index 4805726..c23d7f7 100644 (file)
--- a/drivers/gpu/drm/drm_bufs.c
+++ b/drivers/gpu/drm/drm_bufs.c
@@ -984,8 +984,16 @@ int drm_legacy_addbufs_pci(struct drm_device *dev,
 
        while (entry->buf_count < count) {
                dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
-               if (!dmah)
+               if (!dmah) {
+                       /* Set count correctly so we free the proper amount. */
+                       entry->buf_count = count;
+                       entry->seg_count = count;
+                       drm_cleanup_buf_error(dev, entry);
+                       kfree(temp_pagelist);
+                       mutex_unlock(&dev->struct_mutex);
+                       atomic_dec(&dev->buf_alloc);
                        return -ENOMEM;
+               }
 
                dmah->size = total;
                dmah->vaddr = dma_alloc_coherent(dev->dev,