parport_pc: make sure to release IO ports after probing for IT87XX
Linus Torvalds [Fri, 4 Apr 2008 21:30:31 +0000 (14:30 -0700)]
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

index d76d37b..a858089 100644 (file)
@@ -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 */