From 254e948b2908dd50df9dca4e6ed14b6cc8524fc9 Mon Sep 17 00:00:00 2001
From: Catalin Marinas <catalin.marinas@arm.com>
Date: Fri, 29 Sep 2006 02:00:25 -0700
Subject: [PATCH] [PATCH] Fix memory leak in vc_resize/vc_allocate
Memory leaks can happen in the vc_resize() function in drivers/char/vt.c
because of the vc->vc_screenbuf variable overriding in vc_allocate(). The
kmemleak reported trace is as follows:
<__kmalloc>
<vc_resize>
<fbcon_init>
<visual_init>
<vc_allocate>
<con_open>
<tty_open>
<chrdev_open>
This patch no longer allocates a screen buffer in vc_allocate() if it was
already allocated by vc_resize().
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
drivers/char/vt.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index b49f03375439d..fb75da940b59c 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -737,7 +737,8 @@ int vc_allocate(unsigned int currcons) /* return 0 on success */
visual_init(vc, currcons, 1);
if (!*vc->vc_uni_pagedir_loc)
con_set_default_unimap(vc);
- vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
+ if (!vc->vc_kmalloced)
+ vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
if (!vc->vc_screenbuf) {
kfree(vc);
vc_cons[currcons].d = NULL;
--
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