This is a note to let you know that I've just added the patch titled
s390/crash: fix incorrect number of bytes to copy to user space
to the 5.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-crash-fix-incorrect-number-of-bytes-to-copy-to-.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 4c629ba32d11d7e95d4b297da2176e4bad50c595
Author: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Date: Fri Jul 15 12:59:33 2022 +0200
s390/crash: fix incorrect number of bytes to copy to user space
[ 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@xxxxxxxxxxxxx>
Fixes: df9694c7975f ("s390/dump: streamline oldmem copy functions")
Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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;
}
