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authorPaolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>2006-01-18 17:42:53 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-18 19:20:20 -0800
commitc42791b6ec5453cd7910eac7bfdd88f27173f81c (patch)
treef874b541bfacb27df2bcfdf6fe5823353d431635
parent3b948068b84b9759cdf0965abf3074dcb9230e98 (diff)
[PATCH] uml: make daemon transport behave properly
Avoid uninitialized data in the daemon_data structure. I used this transport before doing proper setup before-hand, and I got some very nice SLAB corruption due to freeing crap pointers. So just make sure to clear everything when appropriate. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/um/drivers/daemon_kern.c4
-rw-r--r--arch/um/drivers/daemon_user.c6
2 files changed, 10 insertions, 0 deletions
diff --git a/arch/um/drivers/daemon_kern.c b/arch/um/drivers/daemon_kern.c
index 30d285b266a..507e3cbac9d 100644
--- a/arch/um/drivers/daemon_kern.c
+++ b/arch/um/drivers/daemon_kern.c
@@ -31,6 +31,10 @@ void daemon_init(struct net_device *dev, void *data)
dpri->fd = -1;
dpri->control = -1;
dpri->dev = dev;
+ /* We will free this pointer. If it contains crap we're burned. */
+ dpri->ctl_addr = NULL;
+ dpri->data_addr = NULL;
+ dpri->local_addr = NULL;
printk("daemon backend (uml_switch version %d) - %s:%s",
SWITCH_VERSION, dpri->sock_type, dpri->ctl_sock);
diff --git a/arch/um/drivers/daemon_user.c b/arch/um/drivers/daemon_user.c
index 1bb085b2824..c944265955e 100644
--- a/arch/um/drivers/daemon_user.c
+++ b/arch/um/drivers/daemon_user.c
@@ -158,10 +158,16 @@ static void daemon_remove(void *data)
struct daemon_data *pri = data;
os_close_file(pri->fd);
+ pri->fd = -1;
os_close_file(pri->control);
+ pri->control = -1;
+
kfree(pri->data_addr);
+ pri->data_addr = NULL;
kfree(pri->ctl_addr);
+ pri->ctl_addr = NULL;
kfree(pri->local_addr);
+ pri->local_addr = NULL;
}
int daemon_user_write(int fd, void *buf, int len, struct daemon_data *pri)