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authorFinn Thain <fthain@telegraphics.com.au>2018-01-13 17:37:13 -0500
committerGeert Uytterhoeven <geert@linux-m68k.org>2018-01-16 16:47:29 +0100
commitd7811a3678eac540a43d9fd3dda7867280844836 (patch)
tree799818f476a0228647bcdfb9dcbc9282970c9cc6 /drivers/nubus
parentf53bad0881a35c45d89bd8c552dc0498b96403c5 (diff)
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>
Diffstat (limited to 'drivers/nubus')
-rw-r--r--drivers/nubus/nubus.c26
1 files changed, 20 insertions, 6 deletions
diff --git a/drivers/nubus/nubus.c b/drivers/nubus/nubus.c
index ef3a115920ca..e7c7e49a074a 100644
--- a/drivers/nubus/nubus.c
+++ b/drivers/nubus/nubus.c
@@ -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;

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