[patch] fbcon: don't use vc_resize() on initialization

Johannes Weiner
2009-07-29T17:23:42Z

Catalin and kmemleak spotted a leak of a VC screen buffer in
vc_allocate() due to the following chain of events:

vc_allocate()
visual_init(init=1)
vc->vc_sw->con_init(init=1)
fbcon_init()
vc_resize()
vc->screen_buf = kmalloc()
vc->screen_buf = kmalloc()

The common way for the VC drivers is to set the screen dimension
parameters manually in the init case and only call vc_resize() for
!init - which allocates a screen buffer according to the new
dimensions.

fbcon instead would do vc_resize() unconditionally and afterwards set
the dimensions manually (again) for !init - i.e. completely upside
down. The vc_resize() allocated buffer would then get lost by
vc_allocate() allocating a fresh one.

Use vc_resize() only for actual resizing to close the leak.

Set the dimensions manually only in initialization mode to remove the
redundant setting in resize mode.

The kmemleak trace from Catalin:

unreferenced object 0xde158000 (size 12288):
comm "Xorg", pid 1439, jiffies 4294961016
hex dump (first 32 bytes):
20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 . . . . . . . .
20 00 20 00 20 00 20 00 20 00 20 00 20 00 20 00 . . . . . . . .
backtrace:
[<c006f74b>] __save_stack_trace+0x17/0x1c
[<c006f81d>] create_object+0xcd/0x188
[<c01f5457>] kmemleak_alloc+0x1b/0x3c
[<c006e303>] __kmalloc+0xdb/0xe8
[<c012cc4b>] vc_do_resize+0x73/0x1e0
[<c012cdf1>] vc_resize+0x15/0x18
[<c011afc1>] fbcon_init+0x1f9/0x2b8
[<c0129e87>] visual_init+0x9f/0xdc
[<c012aff3>] vc_allocate+0x7f/0xfc
[<c012b087>] con_open+0x17/0x80
[<c0120e43>] tty_open+0x1f7/0x2e4
[<c0072fa1>] chrdev_open+0x101/0x118
[<c006ffad>] __dentry_open+0x105/0x1cc
[<c00700fd>] nameidata_to_filp+0x2d/0x38
[<c00788cd>] do_filp_open+0x2c1/0x54c
[<c006fdff>] do_sys_open+0x3b/0xb4

Reported-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Tested-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
---
drivers/video/console/fbcon.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
index 471a9a6..3a44695 100644
--- a/drivers/video/console/fbcon.c
+++ b/drivers/video/console/fbcon.c
@@ -1082,7 +1082,6 @@ static void fbcon_init(struct vc_data *vc, int init)
new_rows = FBCON_SWAP(ops->rotate, info->var.yres, info->var.xres);
new_cols /= vc->vc_font.width;
new_rows /= vc->vc_font.height;
- vc_resize(vc, new_cols, new_rows);

/*
* We must always set the mode. The mode of the previous console
@@ -1111,10 +1110,11 @@ static void fbcon_init(struct vc_data *vc, int init)
* vc_{cols,rows}, but we must not set those if we are only
* resizing the console.
*/
- if (!init) {
+ if (init) {
vc->vc_cols = new_cols;
vc->vc_rows = new_rows;
- }
+ } else
+ vc_resize(vc, new_cols, new_rows);

if (logo)
fbcon_prepare_logo(vc, info, cols, rows, new_cols, new_rows);
--
1.6.3