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nubus: Validate slot resource IDs 

While we are here, include the slot number in the related error messages.

Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Finn Thain 2018-01-13 17:37:13 -05:00 committed by Geert Uytterhoeven
parent f53bad0881
commit d7811a3678
1 changed files with 20 additions and 6 deletions
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26
drivers/nubus/nubus.c
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@ -616,7 +616,8 @@ static int __init nubus_get_board_resource(struct nubus_board *board, int slot,
nbtdata[0], nbtdata[1], nbtdata[2], nbtdata[3]);
if (nbtdata[0] != 1 || nbtdata[1] != 0 ||
nbtdata[2] != 0 || nbtdata[3] != 0)
pr_err("this sResource is not a board resource!\n");
pr_err("Slot %X: sResource is not a board resource!\n",
slot);
break;
}
case NUBUS_RESID_NAME:
@ -672,6 +673,7 @@ static struct nubus_board * __init nubus_add_board(int slot, int bytelanes)
unsigned long dpat;
struct nubus_dir dir;
struct nubus_dirent ent;
int prev_resid = -1;
/* Move to the start of the format block */
rp = nubus_rom_addr(slot);
@ -711,10 +713,10 @@ static struct nubus_board * __init nubus_add_board(int slot, int bytelanes)
/* Directory offset should be small and negative... */
if (!(board->doffset & 0x00FF0000))
pr_warn("Dodgy doffset!\n");
pr_warn("Slot %X: Dodgy doffset!\n", slot);
dpat = nubus_get_rom(&rp, 4, bytelanes);
if (dpat != NUBUS_TEST_PATTERN)
pr_warn("Wrong test pattern %08lx!\n", dpat);
pr_warn("Slot %X: Wrong test pattern %08lx!\n", slot, dpat);
/*
* I wonder how the CRC is meant to work -
@ -740,12 +742,15 @@ static struct nubus_board * __init nubus_add_board(int slot, int bytelanes)
for each of them. */
if (nubus_readdir(&dir, &ent) == -1) {
/* We can't have this! */
pr_err("Board resource not found!\n");
pr_err("Slot %X: Board resource not found!\n", slot);
return NULL;
} else {
nubus_get_board_resource(board, slot, &ent);
}
if (ent.type < 1 || ent.type > 127)
pr_warn("Slot %X: Board resource ID is invalid!\n", slot);
nubus_get_board_resource(board, slot, &ent);
while (nubus_readdir(&dir, &ent) != -1) {
struct nubus_dev *dev;
struct nubus_dev **devp;
@ -754,6 +759,15 @@ static struct nubus_board * __init nubus_add_board(int slot, int bytelanes)
if (dev == NULL)
continue;
/* Resources should appear in ascending ID order. This sanity
* check prevents duplicate resource IDs.
*/
if (dev->resid <= prev_resid) {
kfree(dev);
continue;
}
prev_resid = dev->resid;
/* We zeroed this out above */
if (board->first_dev == NULL)
board->first_dev = dev;