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authorCharan Teja Reddy <quic_charante@quicinc.com>2022-05-09 22:49:57 +0300
committerChristian König <christian.koenig@amd.com>2022-05-10 12:30:51 +0300
commitef3a6b70507a2add2cd2e01f5eb9b54d561bacb9 (patch)
tree29627e51c126c38a890a2684613b3bba7f5585e2 /drivers/dma-buf
parent1b5853dfab7fdde450f00f145327342238135c8a (diff)
downloadlinux-ef3a6b70507a2add2cd2e01f5eb9b54d561bacb9.tar.xz
dma-buf: call dma_buf_stats_setup after dmabuf is in valid list
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@quicinc.com> Tested-by: T.J. Mercier <tjmercier@google.com> Acked-by: T.J. Mercier <tjmercier@google.com> Cc: <stable@vger.kernel.org> # 5.15.x+ Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Christian König <christian.koenig@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/1652125797-2043-1-git-send-email-quic_charante@quicinc.com
Diffstat (limited to 'drivers/dma-buf')
-rw-r--r--drivers/dma-buf/dma-buf.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index df23239b04fc..b1e25ae98302 100644
--- 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 struct dma_buf_export_info *exp_info)
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 struct dma_buf_export_info *exp_info)
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: