From: Alexander Gordeev agordeev@linux.ibm.com
[ Upstream commit f6749da17a34eb08c9665f072ce7c812ff68aad2 ]
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: df9694c7975f ("s390/dump: streamline oldmem copy functions") Signed-off-by: Alexander Gordeev agordeev@linux.ibm.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/s390/kernel/crash_dump.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c index 28124d0fa1d5..f8ebdd70dd31 100644 --- 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; }