Driver core: change add_uevent_var to use a struct

This changes the uevent buffer functions to use a struct instead of a
long list of parameters. It does no longer require the caller to do the
proper buffer termination and size accounting, which is currently wrong
in some places. It fixes a known bug where parts of the uevent
environment are overwritten because of wrong index calculations.

Many thanks to Mathieu Desnoyers for finding bugs and improving the
error handling.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 7 deletions

diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c
index f8b13f0..a0aca46 100644
--- a/drivers/pcmcia/cs.c
+++ b/drivers/pcmcia/cs.c
@@ -907,18 +907,14 @@ int pcmcia_insert_card(struct pcmcia_socket *skt)
 EXPORT_SYMBOL(pcmcia_insert_card);
 
 
-static int pcmcia_socket_uevent(struct device *dev, char **envp,
-			        int num_envp, char *buffer, int buffer_size)
+static int pcmcia_socket_uevent(struct device *dev,
+				struct kobj_uevent_env *env)
 {
 	struct pcmcia_socket *s = container_of(dev, struct pcmcia_socket, dev);
-	int i = 0, length = 0;
 
-	if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
-			   &length, "SOCKET_NO=%u", s->sock))
+	if (add_uevent_var(env, "SOCKET_NO=%u", s->sock))
 		return -ENOMEM;
 
-	envp[i] = NULL;
-
 	return 0;
 }