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console: newport_con: fix an issue about leak related system resources 

[ Upstream commit fd4b824387 ]

A call of the function do_take_over_console() can fail here.
The corresponding system resources were not released then.
Thus add a call of iounmap() and release_mem_region()
together with the check of a failure predicate. and also
add release_mem_region() on device removal.

Fixes: e86bb8acc0 ("[PATCH] VT binding: Make newport_con support binding")
Suggested-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@osdl.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200423164251.3349-1-zhengdejin5@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dejin Zheng 2020-04-24 00:42:51 +08:00 committed by Greg Kroah-Hartman
parent e95d33905a
commit 703a2e85a3
1 changed files with 10 additions and 2 deletions
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12
drivers/video/console/newport_con.c
View File

@ -32,6 +32,8 @@
#include <linux/linux_logo.h>
#include <linux/font.h>
#define NEWPORT_LEN 0x10000
#define FONT_DATA ((unsigned char *)font_vga_8x16.data)
/* borrowed from fbcon.c */
@ -43,6 +45,7 @@
static unsigned char *font_data[MAX_NR_CONSOLES];
static struct newport_regs *npregs;
static unsigned long newport_addr;
static int logo_active;
static int topscan;
@ -702,7 +705,6 @@ const struct consw newport_con = {
static int newport_probe(struct gio_device *dev,
const struct gio_device_id *id)
{
unsigned long newport_addr;
int err;
if (!dev->resource.start)
@ -712,7 +714,7 @@ static int newport_probe(struct gio_device *dev,
return -EBUSY; /* we only support one Newport as console */
newport_addr = dev->resource.start + 0xF0000;
if (!request_mem_region(newport_addr, 0x10000, "Newport"))
if (!request_mem_region(newport_addr, NEWPORT_LEN, "Newport"))
return -ENODEV;
npregs = (struct newport_regs *)/* ioremap cannot fail */
@ -720,6 +722,11 @@ static int newport_probe(struct gio_device *dev,
console_lock();
err = do_take_over_console(&newport_con, 0, MAX_NR_CONSOLES - 1, 1);
console_unlock();
if (err) {
iounmap((void *)npregs);
release_mem_region(newport_addr, NEWPORT_LEN);
}
return err;
}
@ -727,6 +734,7 @@ static void newport_remove(struct gio_device *dev)
{
give_up_console(&newport_con);
iounmap((void *)npregs);
release_mem_region(newport_addr, NEWPORT_LEN);
}
static struct gio_device_id newport_ids[] = {