bpftool: Check malloc return value in mount_bpffs_for_pin

[ Upstream commit d444b06e40855219ef38b5e9286db16d435f06dc ]

Fix and add a missing NULL check for the prior malloc() call.

Fixes: 49a086c201 ("bpftool: implement prog load command")
Signed-off-by: Tobias Klauser <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Reviewed-by: Quentin Monnet <[email protected]>
Acked-by: Roman Gushchin <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
Signed-off-by: Sasha Levin <[email protected]>

tools/bpf/bpftool/common.c

@@ -171,6 +171,11 @@ int mount_bpffs_for_pin(const char *name)
 	int err = 0;
 
 	file = malloc(strlen(name) + 1);
+	if (!file) {
+		p_err("mem alloc failed");
+		return -1;
+	}
+
 	strcpy(file, name);
 	dir = dirname(file);