From 4ed919014eb2b591eb8fdd4dd00226a65faddef4 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 4 Apr 2008 14:30:31 -0700
Subject: [PATCH] parport_pc: make sure to release IO ports after probing for
IT87XX
Commit f63fd7e299ee13da071ecfce2b90b58c5e1562b1 ("parport_pc: detection
for SuperIO IT87XX POST") only released the IO port region on success,
not when the probe for the IT87XX chip failed.
That caused not only a reserved region to leak, but also caused an oops
when the driver module was unloaded and somebody tried to cat
/proc/ioports - because the string that was assigned to the IO port
region was a static string in the module virtual address area.
Reported-by: Lubos Lunak <l.lunak@suse.cz>
Cc: Jan Kara <jack@suse.cz>
Cc: Petr Cvek <petr.cvek@tul.cz>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
drivers/parport/parport_pc.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/parport/parport_pc.c b/drivers/parport/parport_pc.c
index d76d37bcb9cc..a85808938205 100644
--- a/drivers/parport/parport_pc.c
+++ b/drivers/parport/parport_pc.c
@@ -1568,9 +1568,8 @@ static void __devinit detect_and_report_it87(void)
outb(r | 8, 0x2F);
outb(0x02, 0x2E); /* Lock */
outb(0x02, 0x2F);
-
- release_region(0x2e, 1);
}
+ release_region(0x2e, 1);
}
#endif /* CONFIG_PARPORT_PC_SUPERIO */
--
GitLab