You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
48 lines
1.8 KiB
48 lines
1.8 KiB
From f946cee2f81140677b89d3da334f1b3b709d1109 Mon Sep 17 00:00:00 2001
|
|
From: Phil Sutter <phil@nwl.cc>
|
|
Date: Wed, 30 Nov 2022 20:03:30 +0100
|
|
Subject: [PATCH] libiptc: Eliminate garbage access
|
|
|
|
When adding a rule, valgrind prints:
|
|
|
|
Syscall param socketcall.setsockopt(optval) points to uninitialised byte(s)
|
|
at 0x4A8165A: setsockopt (in /lib64/libc.so.6)
|
|
by 0x4857A48: iptc_commit (libiptc.c:2676)
|
|
by 0x10E4BB: iptables_main (iptables-standalone.c:61)
|
|
by 0x49A3349: (below main) (in /lib64/libc.so.6)
|
|
Address 0x4b63788 is 40 bytes inside a block of size 1,448 alloc'd
|
|
at 0x484659F: calloc (vg_replace_malloc.c:1328)
|
|
by 0x4857654: iptc_commit (libiptc.c:2564)
|
|
by 0x10E4BB: iptables_main (iptables-standalone.c:61)
|
|
by 0x49A3349: (below main) (in /lib64/libc.so.6)
|
|
|
|
This is because repl->counters is not initialized upon allocation. Since
|
|
the field is an array, make use of calloc() which implicitly does the
|
|
initialization.
|
|
|
|
Fixes: e37c0dc100c51 ("Revert the recent addition of memset()'s to TC_COMMIT. One of them is bogus and the other one needs more investigation to why valgrind is complaining.")
|
|
Signed-off-by: Phil Sutter <phil@nwl.cc>
|
|
(cherry picked from commit 39a2aa8cbfc99f4a75dfc0786a80ced90952ab29)
|
|
---
|
|
libiptc/libiptc.c | 4 ++--
|
|
1 file changed, 2 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/libiptc/libiptc.c b/libiptc/libiptc.c
|
|
index 56bb75e5c3bef..157fbc4b72ebc 100644
|
|
--- a/libiptc/libiptc.c
|
|
+++ b/libiptc/libiptc.c
|
|
@@ -2554,8 +2554,8 @@ TC_COMMIT(struct xtc_handle *handle)
|
|
+ sizeof(STRUCT_COUNTERS) * new_number;
|
|
|
|
/* These are the old counters we will get from kernel */
|
|
- repl->counters = malloc(sizeof(STRUCT_COUNTERS)
|
|
- * handle->info.num_entries);
|
|
+ repl->counters = calloc(handle->info.num_entries,
|
|
+ sizeof(STRUCT_COUNTERS));
|
|
if (!repl->counters) {
|
|
errno = ENOMEM;
|
|
goto out_free_repl;
|
|
--
|
|
2.40.0
|
|
|