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Subject: media: videobuf2: Fix IS_ERR checking in vb2_dc_put_userptr()
Author: Ma Ke <make_ruc2...@163.com>
Date: Thu Oct 12 15:45:19 2023 +0800
In order to avoid error pointers from frame_vector_pages(), we could
use IS_ERR() to check the return value to fix this. This checking
operation could make sure that vector contains pages.
Signed-off-by: Ma Ke <make_ruc2...@163.com>
Acked-by: Tomasz Figa <tf...@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
drivers/media/common/videobuf2/videobuf2-dma-contig.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
---
diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c
b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
index 2fa455d4a048..3d4fd4ef5310 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
@@ -542,13 +542,14 @@ static void vb2_dc_put_userptr(void *buf_priv)
*/
dma_unmap_sgtable(buf->dev, sgt, buf->dma_dir,
DMA_ATTR_SKIP_CPU_SYNC);
- pages = frame_vector_pages(buf->vec);
- /* sgt should exist only if vector contains pages... */
- BUG_ON(IS_ERR(pages));
if (buf->dma_dir == DMA_FROM_DEVICE ||
- buf->dma_dir == DMA_BIDIRECTIONAL)
- for (i = 0; i < frame_vector_count(buf->vec); i++)
- set_page_dirty_lock(pages[i]);
+ buf->dma_dir == DMA_BIDIRECTIONAL) {
+ pages = frame_vector_pages(buf->vec);
+ /* sgt should exist only if vector contains pages... */
+ if (!WARN_ON_ONCE(IS_ERR(pages)))
+ for (i = 0; i < frame_vector_count(buf->vec);
i++)
+ set_page_dirty_lock(pages[i]);
+ }
sg_free_table(sgt);
kfree(sgt);
} else {
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