From: Charan Teja Reddy <quic_charante@xxxxxxxxxxx>
commit ef3a6b70507a2add2cd2e01f5eb9b54d561bacb9 upstream.
When dma_buf_stats_setup() fails, it closes the dmabuf file which
results into the calling of dma_buf_file_release() where it does
list_del(&dmabuf->list_node) with out first adding it to the proper
list. This is resulting into panic in the below path:
__list_del_entry_valid+0x38/0xac
dma_buf_file_release+0x74/0x158
__fput+0xf4/0x428
____fput+0x14/0x24
task_work_run+0x178/0x24c
do_notify_resume+0x194/0x264
work_pending+0xc/0x5f0
Fix it by moving the dma_buf_stats_setup() after dmabuf is added to the
list.
Fixes: bdb8d06dfefd ("dmabuf: Add the capability to expose DMA-BUF stats in sysfs")
Signed-off-by: Charan Teja Reddy <quic_charante@xxxxxxxxxxx>
Tested-by: T.J. Mercier <tjmercier@xxxxxxxxxx>
Acked-by: T.J. Mercier <tjmercier@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # 5.15.x+
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/1652125797-2043-1-git-send-email-quic_charante@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/dma-buf/dma-buf.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -543,10 +543,6 @@ struct dma_buf *dma_buf_export(const str
file->f_mode |= FMODE_LSEEK;
dmabuf->file = file;
- ret = dma_buf_stats_setup(dmabuf);
- if (ret)
- goto err_sysfs;
-
mutex_init(&dmabuf->lock);
INIT_LIST_HEAD(&dmabuf->attachments);
@@ -554,6 +550,10 @@ struct dma_buf *dma_buf_export(const str
list_add(&dmabuf->list_node, &db_list.head);
mutex_unlock(&db_list.lock);
+ ret = dma_buf_stats_setup(dmabuf);
+ if (ret)
+ goto err_sysfs;
+
return dmabuf;
err_sysfs:
