media: v4l2-compat-ioctl32.c: don't copy back the result for certain errors
Some ioctls need to copy back the result even if the ioctl returned an error. However, don't do this for the error code -ENOTTY. It makes no sense in that cases. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> Cc: <stable@vger.kernel.org> # for v4.15 and up Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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@ -968,6 +968,9 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar
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set_fs(old_fs);
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set_fs(old_fs);
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}
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}
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if (err == -ENOTTY)
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return err;
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/* Special case: even after an error we need to put the
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/* Special case: even after an error we need to put the
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results back for these ioctls since the error_idx will
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results back for these ioctls since the error_idx will
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contain information on which control failed. */
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contain information on which control failed. */
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