From 2a08b0b7a13668378217da7a1a54a96b194b3349 Mon Sep 17 00:00:00 2001 From: Warner Losh Date: Sun, 4 Jul 2010 07:42:52 +0000 Subject: Add a safety-belt. If the identified disk has 0 blocks, don't attach it. This can happen in some cases when plugging in SD/SmartCard PC Cards with empty slots. It is better to detect this bogosity, and refuse to attach rather than panic with a division by zero (in one of many places) down stream. --- sys/dev/ata/ata-disk.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'sys/dev/ata') diff --git a/sys/dev/ata/ata-disk.c b/sys/dev/ata/ata-disk.c index 746b9ca57e63..e80cd2fada33 100644 --- a/sys/dev/ata/ata-disk.c +++ b/sys/dev/ata/ata-disk.c @@ -54,7 +54,7 @@ __FBSDID("$FreeBSD$"); /* prototypes */ static void ad_init(device_t dev); -static void ad_get_geometry(device_t dev); +static int ad_get_geometry(device_t dev); static void ad_set_geometry(device_t dev); static void ad_done(struct ata_request *request); static void ad_describe(device_t dev); @@ -106,7 +106,8 @@ ad_attach(device_t dev) device_set_ivars(dev, adp); /* get device geometry into internal structs */ - ad_get_geometry(dev); + if (ad_get_geometry(dev)) + return ENXIO; /* set the max size if configured */ if (ata_setmax) @@ -410,7 +411,7 @@ ad_init(device_t dev) atadev->max_iosize = DEV_BSIZE; } -static void +static int ad_get_geometry(device_t dev) { struct ata_device *atadev = device_get_softc(dev); @@ -432,6 +433,9 @@ ad_get_geometry(device_t dev) } lbasize = (u_int32_t)atadev->param.lba_size_1 | ((u_int32_t)atadev->param.lba_size_2 << 16); + /* This device exists, but has no size. Filter out this bogus device. */ + if (!lbasize && !adp->total_secs) + return ENXIO; /* does this device need oldstyle CHS addressing */ if (!ad_version(atadev->param.version_major) || !lbasize) @@ -449,6 +453,7 @@ ad_get_geometry(device_t dev) if ((atadev->param.support.command2 & ATA_SUPPORT_ADDRESS48) && lbasize48 > ATA_MAX_28BIT_LBA) adp->total_secs = lbasize48; + return 0; } static void -- cgit v1.3