On Thu, Jul 29, 2010 at 09:36:10AM +0200, Dan Carpenter wrote:
>copy_to/from_user() returns the number of bytes remaining to be copied.
>It never returns a negative value. The correct return code is -EFAULT
>and not -EIO.
>
>All the callers check for non-zero returns so that's Ok, but the return
>code is passed to the user so we should fix this.
>
>Signed-off-by: Dan Carpenter <error27@xxxxxxxxx>
Acked-by: WANG Cong <xiyou.wangcong@xxxxxxxxx>
>
>diff --git a/kernel/kexec.c b/kernel/kexec.c
>index 474a847..ab2258b 100644
>--- a/kernel/kexec.c
>+++ b/kernel/kexec.c
>@@ -151,8 +151,10 @@ static int do_kimage_alloc(struct kimage **rimage, unsigned long entry,
> image->nr_segments = nr_segments;
> segment_bytes = nr_segments * sizeof(*segments);
> result = copy_from_user(image->segment, segments, segment_bytes);
>- if (result)
>+ if (result) {
>+ result = -EFAULT;
> goto out;
>+ }
>
> /*
> * Verify we have good destination addresses. The caller is
>@@ -827,7 +829,7 @@ static int kimage_load_normal_segment(struct kimage *image,
> result = copy_from_user(ptr, buf, uchunk);
> kunmap(page);
> if (result) {
>- result = (result < 0) ? result : -EIO;
>+ result = -EFAULT;
> goto out;
> }
> ubytes -= uchunk;
>@@ -882,7 +884,7 @@ static int kimage_load_crash_segment(struct kimage *image,
> kexec_flush_icache_page(page);
> kunmap(page);
> if (result) {
>- result = (result < 0) ? result : -EIO;
>+ result = -EFAULT;
> goto out;
> }
> ubytes -= uchunk;
>--
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