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authorDan Carpenter <error27@gmail.com>2010-08-10 18:03:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-11 08:59:22 -0700
commitf65a03f6ab6f53a6f2847dbac232dcb38b3b3642 (patch)
treeb6412bfc2ec6dd1cc061e11e60cad1949ca6cf8d /kernel/kexec.c
parent832ccf6f44969b616b2aeea25276684cf104fa3b (diff)
downloadlinux-f65a03f6ab6f53a6f2847dbac232dcb38b3b3642.tar.bz2
kexec: return -EFAULT on copy_to_user() failures
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@gmail.com> Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Simon Kagstrom <simon.kagstrom@netinsight.net> Acked-by: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/kexec.c')
-rw-r--r--kernel/kexec.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 131b1703936f..c0613f7d6730 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;