Patch "s390/ptrace: fix PTRACE_GET_LAST_BREAK error handling" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    s390/ptrace: fix PTRACE_GET_LAST_BREAK error handling

to the 5.15-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-ptrace-fix-ptrace_get_last_break-error-handling.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 02c08bcafba77f5edd29f1e541a9768bacfcf1e7
Author: Heiko Carstens <hca@xxxxxxxxxxxxx>
Date:   Mon Mar 6 12:31:30 2023 +0100

    s390/ptrace: fix PTRACE_GET_LAST_BREAK error handling
    
    [ Upstream commit f9bbf25e7b2b74b52b2f269216a92657774f239c ]
    
    Return -EFAULT if put_user() for the PTRACE_GET_LAST_BREAK
    request fails, instead of silently ignoring it.
    
    Reviewed-by: Sven Schnelle <svens@xxxxxxxxxxxxx>
    Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
    Signed-off-by: Vasily Gorbik <gor@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 0ea3d02b378de..516c21baf3ad3 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -481,9 +481,7 @@ long arch_ptrace(struct task_struct *child, long request,
 		}
 		return 0;
 	case PTRACE_GET_LAST_BREAK:
-		put_user(child->thread.last_break,
-			 (unsigned long __user *) data);
-		return 0;
+		return put_user(child->thread.last_break, (unsigned long __user *)data);
 	case PTRACE_ENABLE_TE:
 		if (!MACHINE_HAS_TE)
 			return -EIO;
@@ -837,9 +835,7 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
 		}
 		return 0;
 	case PTRACE_GET_LAST_BREAK:
-		put_user(child->thread.last_break,
-			 (unsigned int __user *) data);
-		return 0;
+		return put_user(child->thread.last_break, (unsigned int __user *)data);
 	}
 	return compat_ptrace_request(child, request, addr, data);
 }



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