AST-2017-010: Fix cdr_object_update_party_b_userfield_cb() buf overrun

cdr_object_update_party_b_userfield_cb() could overrun the fixed buffer if
the supplied string is too long.  The long string could be supplied by
external means using the CDR(userfield) function.

This may seem reminiscent to AST-2017-001 (ASTERISK_26897) and it is.  The
earlier patch fixed the buffer overrun for Party A's userfield while this
patch fixes the same thing for Party B's userfield.

ASTERISK-27337

Change-Id: I0fa767f65ecec7e676ca465306ff9e0edbf3b652

diff --git a/main/cdr.c b/main/cdr.c
index ecf7bd30bc5dca2fe0f749a8f64a7e7dbcfb0996..5fd2a751297bbdfa079d0a1c9f46488f87e669de 100644 (file)
--- a/main/cdr.c
+++ b/main/cdr.c
@@ -3229,7 +3229,8 @@ static int cdr_object_update_party_b_userfield_cb(void *obj, void *arg, int flag
                }
                if (it_cdr->party_b.snapshot
                        && !strcasecmp(it_cdr->party_b.snapshot->name, info->channel_name)) {
-                       strcpy(it_cdr->party_b.userfield, info->userfield);
+                       ast_copy_string(it_cdr->party_b.userfield, info->userfield,
+                               sizeof(it_cdr->party_b.userfield));
                }
        }
        return 0;
@@ -3252,7 +3253,8 @@ void ast_cdr_setuserfield(const char *channel_name, const char *userfield)
                        if (it_cdr->fn_table == &finalized_state_fn_table && it_cdr->next != NULL) {
                                continue;
                        }
-                       ast_copy_string(it_cdr->party_a.userfield, userfield, AST_MAX_USER_FIELD);
+                       ast_copy_string(it_cdr->party_a.userfield, userfield,
+                               sizeof(it_cdr->party_a.userfield));
                }
                ao2_unlock(cdr);
        }