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[iproute,v4,1/6] ipntable: Avoid memory allocation for filter.name

Message ID 20170824095150.5469-2-phil@nwl.cc
State Accepted, archived
Delegated to: stephen hemminger
Headers show

Commit Message

Phil Sutter Aug. 24, 2017, 9:51 a.m. UTC 
The original issue was that filter.name might end up unterminated if
user provided string was too long. But in fact it is not necessary to
copy the commandline parameter at all: just make filter.name point to it
instead.

Signed-off-by: Phil Sutter <phil@nwl.cc>
---
 ip/ipntable.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
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Patch

diff --git a/ip/ipntable.c b/ip/ipntable.c
index 1837909fa42e7..88236ce0ec1e1 100644
--- a/ip/ipntable.c
+++ b/ip/ipntable.c
@@ -37,7 +37,7 @@  static struct
 	int family;
 	int index;
 #define NONE_DEV	(-1)
-	char name[1024];
+	const char *name;
 } filter;
 
 static void usage(void) __attribute__((noreturn));
@@ -367,7 +367,7 @@  static int print_ntable(const struct sockaddr_nl *who, struct nlmsghdr *n, void
 	if (tb[NDTA_NAME]) {
 		const char *name = rta_getattr_str(tb[NDTA_NAME]);
 
-		if (strlen(filter.name) > 0 && strcmp(filter.name, name))
+		if (filter.name && strcmp(filter.name, name))
 			return 0;
 	}
 	if (tb[NDTA_PARMS]) {
@@ -631,7 +631,7 @@  static int ipntable_show(int argc, char **argv)
 		} else if (strcmp(*argv, "name") == 0) {
 			NEXT_ARG();
 
-			strncpy(filter.name, *argv, sizeof(filter.name));
+			filter.name = *argv;
 		} else
 			invarg("unknown", *argv);