| Message ID | 20190618131843.GA29463@mwanda (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] drm: return -EFAULT if copy_to_user() fails | expand |
On Tue, Jun 18, 2019 at 04:18:43PM +0300, Dan Carpenter wrote: > 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> Thanks Dan, I've applied this to drm-misc-fixes. Sean > --- > v2: The first version was missing a chunk > > drivers/gpu/drm/drm_bufs.c | 5 ++++- > 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 68dacf8422c6..8ce9d73fab4f 100644 > --- a/drivers/gpu/drm/drm_bufs.c > +++ b/drivers/gpu/drm/drm_bufs.c > @@ -1351,7 +1351,10 @@ 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 586aa28024c5..a16b6dc2fa47 100644 > --- a/drivers/gpu/drm/drm_ioc32.c > +++ b/drivers/gpu/drm/drm_ioc32.c > @@ -378,7 +378,10 @@ 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, > -- > 2.20.1 >
On Tue, Jun 18, 2019 at 01:16:29PM -0400, Sean Paul wrote: > On Tue, Jun 18, 2019 at 04:18:43PM +0300, Dan Carpenter wrote: > > 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> > > Thanks Dan, I've applied this to drm-misc-fixes. FWIW, Acked-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c index 68dacf8422c6..8ce9d73fab4f 100644 --- a/drivers/gpu/drm/drm_bufs.c +++ b/drivers/gpu/drm/drm_bufs.c @@ -1351,7 +1351,10 @@ 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 586aa28024c5..a16b6dc2fa47 100644 --- a/drivers/gpu/drm/drm_ioc32.c +++ b/drivers/gpu/drm/drm_ioc32.c @@ -378,7 +378,10 @@ 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,
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> --- v2: The first version was missing a chunk drivers/gpu/drm/drm_bufs.c | 5 ++++- drivers/gpu/drm/drm_ioc32.c | 5 ++++- 2 files changed, 8 insertions(+), 2 deletions(-)