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author | Dan Carpenter <dan.carpenter@oracle.com> | 2019-06-18 16:18:43 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-14 09:09:45 +0300 |
commit | b4ef52d26aec77217f27d7a399816b2a135b63f6 (patch) | |
tree | 1516406df3ada5f6b49b02e9cce6fc9a8ae2a6b5 /drivers/gpu/drm | |
parent | d929834822c78b3a88105ec52a796f08f3a8976e (diff) | |
download | linux-b4ef52d26aec77217f27d7a399816b2a135b63f6.tar.xz |
drm: return -EFAULT if copy_to_user() fails
[ Upstream commit 74b67efa8d7b4f90137f0ab9a80dd319da050350 ]
The copy_from_user() function returns the number of bytes remaining
to be copied but we want to return a negative error code. Otherwise
the callers treat it as a successful copy.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190618131843.GA29463@mwanda
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/gpu/drm')
-rw-r--r-- | drivers/gpu/drm/drm_bufs.c | 5 | ||||
-rw-r--r-- | drivers/gpu/drm/drm_ioc32.c | 5 |
2 files changed, 8 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c index e407adb033e7..4fbc34425570 100644 --- a/drivers/gpu/drm/drm_bufs.c +++ b/drivers/gpu/drm/drm_bufs.c @@ -1332,7 +1332,10 @@ static int copy_one_buf(void *data, int count, struct drm_buf_entry *from) .size = from->buf_size, .low_mark = from->low_mark, .high_mark = from->high_mark}; - return copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags)); + + if (copy_to_user(to, &v, offsetof(struct drm_buf_desc, flags))) + return -EFAULT; + return 0; } int drm_legacy_infobufs(struct drm_device *dev, void *data, diff --git a/drivers/gpu/drm/drm_ioc32.c b/drivers/gpu/drm/drm_ioc32.c index 0e3043e08c69..f8672238d444 100644 --- a/drivers/gpu/drm/drm_ioc32.c +++ b/drivers/gpu/drm/drm_ioc32.c @@ -372,7 +372,10 @@ static int copy_one_buf32(void *data, int count, struct drm_buf_entry *from) .size = from->buf_size, .low_mark = from->low_mark, .high_mark = from->high_mark}; - return copy_to_user(to + count, &v, offsetof(drm_buf_desc32_t, flags)); + + if (copy_to_user(to + count, &v, offsetof(drm_buf_desc32_t, flags))) + return -EFAULT; + return 0; } static int drm_legacy_infobufs32(struct drm_device *dev, void *data, |