[PATCH iproute2-next] ip: check return value of iproute_flush_cache() in irpoute.c

[Anton Moryakov <ant.v.moryakov@gmail.com>]

Static analyzer reported:
Return value of function 'iproute_flush_cache', called at iproute.c:1732, 
is not checked. The return value is obtained from function 'open64' and possibly contains an error code.

Corrections explained:
The function iproute_flush_cache() may return an error code, which was
previously ignored. This could lead to unexpected behavior if the cache
flush fails. Added error handling to ensure the function fails gracefully
when iproute_flush_cache() returns an error.

Triggers found by static analyzer Svace.

Signed-off-by: Anton Moryakov <ant.v.moryakov@gmail.com>
---
 ip/iproute.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ip/iproute.c b/ip/iproute.c
index e1fe26ce..64e7d77e 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -1729,7 +1729,10 @@ static int iproute_flush(int family, rtnl_filter_t filter_fn)
 
 	if (filter.cloned) {
 		if (family != AF_INET6) {
-			iproute_flush_cache();
+			ret = iproute_flush_cache();
+			if(ret < 0)
+				return ret;
+				
 			if (show_stats)
 				printf("*** IPv4 routing cache is flushed.\n");
 		}
-- 
2.30.2