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media: videobuf2: Fix IS_ERR checking in vb2_dc_put_userptr()

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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_ruc2021@163.com>
Acked-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Ma Ke 2023-10-12 15:45:19 +08:00 committed by Hans Verkuil
parent 2a76e7679b
commit 554df753a6
1 changed files with 7 additions and 6 deletions
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13
drivers/media/common/videobuf2/videobuf2-dma-contig.c
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@ -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 {