The final check in regex_escape() was off by one byte
and should require one byte less to put the NUL byte.

Assisted-by: LLM
Signed-off-by: Günther Noack <[email protected]>
---
 tools/testing/selftests/landlock/common.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/landlock/common.h 
b/tools/testing/selftests/landlock/common.h
index 91842f618a3a..ae6a0eb8e343 100644
--- a/tools/testing/selftests/landlock/common.h
+++ b/tools/testing/selftests/landlock/common.h
@@ -294,7 +294,7 @@ static __maybe_unused ssize_t regex_escape(const char 
*const src, char *dst,
                        *d++ = *s;
                }
        }
-       if (d >= dst + dst_size - 1)
+       if (d >= dst + dst_size)
                goto err_nomem;
 
        *d = '\0';
-- 
2.56.0


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