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Date: Mon, 15 Jul 2019 10:35:26 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Jungo Lin <jungo.lin@...iatek.com>, Mauro Carvalho Chehab <mchehab+samsung@...nel.org>, Sasha Levin <sashal@...nel.org>, linux-media@...r.kernel.org Subject: [PATCH AUTOSEL 4.9 10/73] media: media_device_enum_links32: clean a reserved field From: Jungo Lin <jungo.lin@...iatek.com> [ Upstream commit f49308878d7202e07d8761238e01bd0e5fce2750 ] In v4l2-compliance utility, test MEDIA_IOC_ENUM_ENTITIES will check whether reserved field of media_links_enum filled with zero. However, for 32 bit program, the reserved field is missing copy from kernel space to user space in media_device_enum_links32 function. This patch adds the cleaning a reserved field logic in media_device_enum_links32 function. Signed-off-by: Jungo Lin <jungo.lin@...iatek.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/media/media-device.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c index 6f46c59415fe..6062c0cfa632 100644 --- a/drivers/media/media-device.c +++ b/drivers/media/media-device.c @@ -474,6 +474,7 @@ static long media_device_enum_links32(struct media_device *mdev, { struct media_links_enum links; compat_uptr_t pads_ptr, links_ptr; + int ret; memset(&links, 0, sizeof(links)); @@ -485,7 +486,13 @@ static long media_device_enum_links32(struct media_device *mdev, links.pads = compat_ptr(pads_ptr); links.links = compat_ptr(links_ptr); - return media_device_enum_links(mdev, &links); + ret = media_device_enum_links(mdev, &links); + if (ret) + return ret; + + memset(ulinks->reserved, 0, sizeof(ulinks->reserved)); + + return 0; } #define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32) -- 2.20.1
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