Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.2 047/413] media: mc-device.c: dont memset __user pointer contents | Date | Wed, 24 Jul 2019 21:15:38 +0200 |
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[ Upstream commit 518fa4e0e0da97ea2e17c95ab57647ce748a96e2 ]
You can't memset the contents of a __user pointer. Instead, call copy_to_user to copy links.reserved (which is zeroed) to the user memory.
This fixes this sparse warning:
SPARSE:drivers/media/mc/mc-device.c drivers/media/mc/mc-device.c:521:16: warning: incorrect type in argument 1 (different address spaces)
Fixes: f49308878d720 ("media: media_device_enum_links32: clean a reserved field")
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/media/media-device.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c index b9bb4904bba1..e19df5165e78 100644 --- a/drivers/media/media-device.c +++ b/drivers/media/media-device.c @@ -510,8 +510,9 @@ static long media_device_enum_links32(struct media_device *mdev, if (ret) return ret; - memset(ulinks->reserved, 0, sizeof(ulinks->reserved)); - + if (copy_to_user(ulinks->reserved, links.reserved, + sizeof(ulinks->reserved))) + return -EFAULT; return 0; } -- 2.20.1
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