s390/crash: fix incorrect number of bytes to copy to user space

The number of bytes in a chunk is correctly calculated, but instead
the total number of bytes is passed to copy_to_user_real() function.

Reported-by: Matthew Wilcox <willy@infradead.org>
Fixes: 056ae38a45b2 ("s390/dump: streamline oldmem copy functions")
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c
index 117f13b3d1539ccb5cb4467125eaa85774f1d308..0efee5c49b1ec8b0b01562286d91136b58fe0dc9 100644 (file)
--- a/arch/s390/kernel/crash_dump.c
+++ b/arch/s390/kernel/crash_dump.c
@@ -199,7 +199,7 @@ static int copy_oldmem_user(void __user *dst, unsigned long src, size_t count)
                        } else {
                                len = count;
                        }
-                       rc = copy_to_user_real(dst, src, count);
+                       rc = copy_to_user_real(dst, src, len);
                        if (rc)
                                return rc;
                }