linux-kernel - [PATCH] media: videobuf2: Fix IS_ERR checking in vb2_vmalloc_put

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Date:   Sun, 24 Sep 2023 20:44:25 +0800
From:   Ma Ke <make_ruc2021@....com>
To:     tfiga@...omium.org, m.szyprowski@...sung.com, mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ma Ke <make_ruc2021@....com>
Subject: [PATCH] media: videobuf2: Fix IS_ERR checking in vb2_vmalloc_put_userptr()

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@....com>
---
 drivers/media/common/videobuf2/videobuf2-vmalloc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/common/videobuf2/videobuf2-vmalloc.c b/drivers/media/common/videobuf2/videobuf2-vmalloc.c
index 7c635e292106..c37775080aff 100644
--- a/drivers/media/common/videobuf2/videobuf2-vmalloc.c
+++ b/drivers/media/common/videobuf2/videobuf2-vmalloc.c
@@ -134,6 +134,7 @@ static void vb2_vmalloc_put_userptr(void *buf_priv)
 	if (!buf->vec->is_pfns) {
 		n_pages = frame_vector_count(buf->vec);
 		pages = frame_vector_pages(buf->vec);
+		BUG_ON(IS_ERR(pages));
 		if (vaddr)
 			vm_unmap_ram((void *)vaddr, n_pages);
 		if (buf->dma_dir == DMA_FROM_DEVICE ||
-- 
2.37.2