With respect to shell.c:shell_exec, there is an inconsistency in how NULL
checks are applied. Despite the fact that it seems like `shell_exec` is never
called with pArg set to NULL, the method is written such that it could be.
In order to be consistent, it seems like pArg should be checked for NULL before
calling `explain_data_delete`, which dereferences the variable. It is only
necessary to call `explain_data_delete` after calling `explain_data_prepare`,
and the latter is only called when pArg is non-NULL.
I’ve included a diff below to help illustrate what I mean:
---
src/shell.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff a/src/shell.c b/src/shell.c
--- a/src/shell.c
+++ b/src/shell.c
@@ -1954,7 +1954,10 @@ static int shell_exec(
}
exec_prepared_stmt(pArg, pStmt, xCallback);
- explain_data_delete(pArg);
+
+ if( pArg ){
+ explain_data_delete(pArg);
+ }
/* print usage stats if stats on */
if( pArg && pArg->statsOn ){
--
Thanks,
Max Radermacher
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