[SCM] gawk branch, master, updated. gawk-4.1.0-5405-gc89ccf6a

[Arnold Robbins]

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      from  30029046a2e096df4d9fcb7aedc01e393abce88d (commit)

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- Log -----------------------------------------------------------------
http://git.sv.gnu.org/cgit/gawk.git/commit/?id=c89ccf6a1384db4bee99ff0a9338016f5911fc56

commit c89ccf6a1384db4bee99ff0a9338016f5911fc56
Author: Arnold D. Robbins <arnold@skeeve.com>
Date:   Tue Oct 24 10:21:50 2023 +0300

    Fix a potential use-after-free error.

diff --git a/ChangeLog b/ChangeLog
index e00083e4..fda3411f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2023-10-24         Arnold D. Robbins     <arnold@skeeve.com>
+
+       * builtin.c (setup_frame): Fix a potential use after free
+       error. Thanks to Michal Jaegermann for the report.
+
 2023-10-23         Arnold D. Robbins     <arnold@skeeve.com>
 
        * builtin.c (do_sub): Fix a use-after-free issue reported
diff --git a/eval.c b/eval.c
index b46e3aae..6bc39deb 100644
--- a/eval.c
+++ b/eval.c
@@ -1317,8 +1317,11 @@ setup_frame(INSTRUCTION *pc)
 
                /* $0 needs to be passed by value to a function */
                if (m == fields_arr[0]) {
+                       NODE *copy;
+
+                       copy = dupnode(m);      // will be real copy
                        DEREF(m);
-                       m = dupnode(m);
+                       m = copy;
                }
 
                switch (m->type) {

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog | 5 +++++
 eval.c    | 5 ++++-
 2 files changed, 9 insertions(+), 1 deletion(-)


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