[flang][runtime] Fix seg fault in intrinsic execute_command_line

[sihuan]

Fixes #77975

[llvmbot]

@llvm/pr-subscribers-flang-runtime

Author: SiHuaN (sihuan)

Changes

Fixes #77975

---

Full diff: https://github.com/llvm/llvm-project/pull/78126.diff

1 Files Affected:

• (modified) flang/runtime/execute.cpp (+1-1)

diff --git a/flang/runtime/execute.cpp b/flang/runtime/execute.cpp
index c327f07f5cbffe..7368f2f576519c 100644
--- a/flang/runtime/execute.cpp
+++ b/flang/runtime/execute.cpp
@@ -87,7 +87,7 @@ int TerminationCheck(int status, const Descriptor *cmdstat,
           "Invalid command quit with exit status code: %d", exitStatusVal);
     } else {
       CheckAndStoreIntToDescriptor(cmdstat, INVALID_CL_ERR, terminator);
-      CopyCharsToDescriptor(*cmdmsg, "Invalid command line");
+      CheckAndCopyCharsToDescriptor(cmdmsg, "Invalid command line");
     }
   }
 #if defined(WIFSIGNALED) && defined(WTERMSIG)

[yi-wu-arm]

Thanks for providing this fix! I figure out that I had written the logic in a reversed way.
It should be StoreInt with cmdstat and CheckStoreChars with cmdmsg. Do you mind to change other lines in TerminationCheck as well?

[yi-wu-arm]

LGTM, thanks for providing this fix!