The return values of copy_to_user() and copy_from_user() cannot be negative.
Found using the following semantich patch:
<spml>
@exists@
identifier ret;
statement S;
expression E;
@@
(
* ret = copy_to_user(...);
|
* ret = copy_from_user(...);
)
... when != ret = E
when != if (ret) { <+... ret = E; ...+> }
* if (ret < 0)
S
</spml>
Signed-off-by: Cyril Roelandt <tipecaml@xxxxxxxxx>
---
drivers/staging/media/solo6x10/v4l2-enc.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/staging/media/solo6x10/v4l2-enc.c b/drivers/staging/media/solo6x10/v4l2-enc.c
index f8f0da9..4977e86 100644
--- a/drivers/staging/media/solo6x10/v4l2-enc.c
+++ b/drivers/staging/media/solo6x10/v4l2-enc.c
@@ -1619,6 +1619,8 @@ static int solo_s_ext_ctrls(struct file *file, void *priv,
solo_enc->osd_text[OSD_TEXT_MAX] = '\0';
if (!err)
err = solo_osd_print(solo_enc);
+ else
+ err = -EFAULT;
}
break;
default:
@@ -1654,6 +1656,8 @@ static int solo_g_ext_ctrls(struct file *file, void *priv,
err = copy_to_user(ctrl->string,
solo_enc->osd_text,
OSD_TEXT_MAX);
+ if (err)
+ err = -EFAULT;
}
break;
default:
--
1.7.10.4
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