Messages in this thread | | | From | Dawson Engler <> | Subject | [CHECKER] race in 2.5.62/drivers/isdn/i4l/isdn_common.c? | Date | Sat, 22 Mar 2003 04:26:04 -0800 (PST) |
| |
Enclosed is a potential race in drv_stat_unload. It seems suspicious: - potentially a use-after-free (if put_drv deallocs)
- potentially a race where the global var drv->channels is used without protection (or is this routine called with drivers_lock held?)
Dawson
/u2/engler/mc/oses/linux/linux-2.5.62/drivers/isdn/i4l/isdn_common.c:636:drv_stat_unload:ERROR:RACE:636:636:unprotected access to variable (*dev).channels,isdn_dev.channels,1[nvars=2] [vars=(*dev).channels,isdn_dev.channels,1:636 (*dev).channels,isdn_dev.channels,1:636 ][non_csect_reads=1] [non_csect_writes=1][modified=1] [locked_uses=1] [unlocked_uses=1] [n_writes=2] [n_reads=3] [n_root=2] [n_file_write=1] [n_file_read=1] [n_unlocked=1][has_locked=1] [depth=1] [path=/u2/engler/mc/oses/linux/linux-2.5.62/drivers/isdn/i4l/isdn_common.c:drv_stat_unload:634->end=/u2/engler/mc/oses/linux/linux-2.5.62/drivers/isdn/i4l/isdn_common.c:drv_stat_unload:636] [score=5] [z=-0.62] [rank=easy]
spin_lock_irqsave(&drivers_lock, flags); drivers[drv->di] = NULL; spin_unlock_irqrestore(&drivers_lock, flags); put_drv(drv);
Error ---> dev->channels -= drv->channels;
isdn_info_update(); return 0;
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |