In __rtnl_talk_iov() main loop, err is a pointer to memory in dynamically allocated 'buf' that is used to store netlink messages. If netlink message is an error message, buf is deallocated before returning with error code. However, on return err->error code is checked one more time to generate return value, after memory which err points to has already been freed. Save error code in temporary variable and use the variable to generate return value.
Signed-off-by: Vlad Buslov <vla...@mellanox.com> --- lib/libnetlink.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/lib/libnetlink.c b/lib/libnetlink.c index f8b8fbfd0010..bc8338052e17 100644 --- a/lib/libnetlink.c +++ b/lib/libnetlink.c @@ -802,6 +802,7 @@ static int __rtnl_talk_iov(struct rtnl_handle *rtnl, struct iovec *iov, if (h->nlmsg_type == NLMSG_ERROR) { struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h); + int error = err->error; if (l < sizeof(struct nlmsgerr)) { fprintf(stderr, "ERROR truncated\n"); @@ -825,7 +826,7 @@ static int __rtnl_talk_iov(struct rtnl_handle *rtnl, struct iovec *iov, else free(buf); - return err->error ? -i : 0; + return error ? -i : 0; } if (answer) { -- 2.7.5