diff options
| author | George Spelvin <linux@horizon.com> | 2013-02-10 10:43:41 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-02-13 18:43:07 +0100 |
| commit | ce3da1a654c83c6c9cb0b33477815e5d1293cc00 (patch) | |
| tree | c4d24d98eceadc88d209e47d7957ef3415a456d3 /drivers/pps/clients/pps-ldisc.c | |
| parent | pps: Fix a use-after free bug when unregistering a source. (diff) | |
| download | linux-ce3da1a654c83c6c9cb0b33477815e5d1293cc00.tar.xz linux-ce3da1a654c83c6c9cb0b33477815e5d1293cc00.zip | |
pps: Don't crash the machine when exiting will do
PPS is not really the must-have subsystem that warrants crashing
the machine if the ldisc interface is broken.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: George Spelvin <linux@horizon.com>
Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/pps/clients/pps-ldisc.c')
| -rw-r--r-- | drivers/pps/clients/pps-ldisc.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/pps/clients/pps-ldisc.c b/drivers/pps/clients/pps-ldisc.c index 60cee9e0ecb3..a94f73e1480d 100644 --- a/drivers/pps/clients/pps-ldisc.c +++ b/drivers/pps/clients/pps-ldisc.c @@ -25,6 +25,7 @@ #include <linux/serial_core.h> #include <linux/tty.h> #include <linux/pps_kernel.h> +#include <linux/bug.h> #define PPS_TTY_MAGIC 0x0001 @@ -33,7 +34,12 @@ static void pps_tty_dcd_change(struct tty_struct *tty, unsigned int status, { struct pps_device *pps = pps_lookup_dev(tty); - BUG_ON(pps == NULL); + /* + * This should never fail, but the ldisc locking is very + * convoluted, so don't crash just in case. + */ + if (WARN_ON_ONCE(pps == NULL)) + return; /* Now do the PPS event report */ pps_event(pps, ts, status ? PPS_CAPTUREASSERT : @@ -93,6 +99,9 @@ static void pps_tty_close(struct tty_struct *tty) alias_n_tty_close(tty); + if (WARN_ON(!pps)) + return; + dev_info(pps->dev, "removed\n"); pps_unregister_source(pps); } |