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authorDan Carpenter <error27@gmail.com>2009-07-19 15:46:09 +0400
committerRusty Russell <rusty@rustcorp.com.au>2009-07-30 10:33:43 +0400
commitf294526279cda8934b0313ebd02184a16ba888c9 (patch)
treea89b108800b8f8cdcf6a6eae4f69bb10df3ac79c
parent658874f05d040ca96eb5ba9b1c30ce0ff287d762 (diff)
downloadlinux-f294526279cda8934b0313ebd02184a16ba888c9.tar.xz
lguest: dereferencing freed mem in add_eventfd()
"new" was freed and then dereferenced. Also the return value wasn't being used so I modified the caller as well. Compile tested only. Found by smatch (http://repo.or.cz/w/smatch.git). regards, dan carpenter Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
-rw-r--r--drivers/lguest/lguest_user.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/lguest/lguest_user.c b/drivers/lguest/lguest_user.c
index 9f9a2953b383..407722a8e0c4 100644
--- a/drivers/lguest/lguest_user.c
+++ b/drivers/lguest/lguest_user.c
@@ -52,8 +52,9 @@ static int add_eventfd(struct lguest *lg, unsigned long addr, int fd)
new->map[new->num].addr = addr;
new->map[new->num].event = eventfd_ctx_fdget(fd);
if (IS_ERR(new->map[new->num].event)) {
+ int err = PTR_ERR(new->map[new->num].event);
kfree(new);
- return PTR_ERR(new->map[new->num].event);
+ return err;
}
new->num++;
@@ -83,7 +84,7 @@ static int attach_eventfd(struct lguest *lg, const unsigned long __user *input)
err = add_eventfd(lg, addr, fd);
mutex_unlock(&lguest_lock);
- return 0;
+ return err;
}
/*L:050 Sending an interrupt is done by writing LHREQ_IRQ and an interrupt