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[sanboot] Prevent leaking a stack reference for "keep-san" AoE

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When the "keep-san" option is used, the function is exited without
unregistering the stack allocated int13h drive.  To prevent a dangling
pointer to the stack, these structs should be heap allocated.

Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Marty Connor <mdc@etherboot.org>
This commit is contained in:
Stefan Hajnoczi 2010-01-05 08:05:32 +00:00 committed by Marty Connor
parent 245dca9ce6
commit 37883e99fd
1 changed files with 33 additions and 21 deletions
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54
src/arch/i386/interface/pcbios/aoeboot.c
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@ -1,11 +1,11 @@
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <byteswap.h>
#include <errno.h>
#include <gpxe/aoe.h>
#include <gpxe/ata.h>
#include <gpxe/netdevice.h>
#include <gpxe/settings.h>
#include <gpxe/sanboot.h>
#include <gpxe/abft.h>
#include <int13.h>
@ -13,50 +13,62 @@
FILE_LICENCE ( GPL2_OR_LATER );
static int aoeboot ( const char *root_path ) {
struct ata_device ata;
struct int13_drive drive;
struct ata_device *ata;
struct int13_drive *drive;
int rc;
memset ( &ata, 0, sizeof ( ata ) );
memset ( &drive, 0, sizeof ( drive ) );
ata = zalloc ( sizeof ( *ata ) );
if ( ! ata ) {
rc = -ENOMEM;
goto err_alloc_ata;
}
drive = zalloc ( sizeof ( *drive ) );
if ( ! drive ) {
rc = -ENOMEM;
goto err_alloc_drive;
}
/* FIXME: ugly, ugly hack */
struct net_device *netdev = last_opened_netdev();
if ( ( rc = aoe_attach ( &ata, netdev, root_path ) ) != 0 ) {
if ( ( rc = aoe_attach ( ata, netdev, root_path ) ) != 0 ) {
printf ( "Could not attach AoE device: %s\n",
strerror ( rc ) );
goto error_attach;
goto err_attach;
}
if ( ( rc = init_atadev ( &ata ) ) != 0 ) {
if ( ( rc = init_atadev ( ata ) ) != 0 ) {
printf ( "Could not initialise AoE device: %s\n",
strerror ( rc ) );
goto error_init;
goto err_init;
}
/* FIXME: ugly, ugly hack */
struct aoe_session *aoe =
container_of ( ata.backend, struct aoe_session, refcnt );
container_of ( ata->backend, struct aoe_session, refcnt );
abft_fill_data ( aoe );
drive.blockdev = &ata.blockdev;
drive->blockdev = &ata->blockdev;
register_int13_drive ( &drive );
printf ( "Registered as BIOS drive %#02x\n", drive.drive );
printf ( "Booting from BIOS drive %#02x\n", drive.drive );
rc = int13_boot ( drive.drive );
register_int13_drive ( drive );
printf ( "Registered as BIOS drive %#02x\n", drive->drive );
printf ( "Booting from BIOS drive %#02x\n", drive->drive );
rc = int13_boot ( drive->drive );
printf ( "Boot failed\n" );
/* Leave drive registered, if instructed to do so */
if ( keep_san() )
return rc;
printf ( "Unregistering BIOS drive %#02x\n", drive.drive );
unregister_int13_drive ( &drive );
printf ( "Unregistering BIOS drive %#02x\n", drive->drive );
unregister_int13_drive ( drive );
error_init:
aoe_detach ( &ata );
error_attach:
err_init:
aoe_detach ( ata );
err_attach:
free ( drive );
err_alloc_drive:
free ( ata );
err_alloc_ata:
return rc;
}