If the link target length exceeds 'sizeof(tmp)' bytes, readlink() will
return 'sizeof(tmp)'. Using this value as index is illegal.
Original update from Phil, for the conntrack-tools tree, which also has
a copy of this function.
Fixes: 6d085b22a8b5 ("table: support for the table owner flag")
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
Same as:
https://patchwork.ozlabs.org/project/netfilter-devel/patch/20221220153847.24152-2-phil@xxxxxx/
src/owner.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/owner.c b/src/owner.c
index 2d98a2e98028..20bed38b2a09 100644
--- a/src/owner.c
+++ b/src/owner.c
@@ -66,7 +66,7 @@ static char *portid2name(pid_t pid, uint32_t portid, unsigned long inode)
continue;
rl = readlink(procname, tmp, sizeof(tmp));
- if (rl <= 0 || rl > (ssize_t)sizeof(tmp))
+ if (rl <= 0 || rl >= (ssize_t)sizeof(tmp))
continue;
tmp[rl] = 0;
--
2.30.2
