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Subject[CHECKER] 4 potential user-pointer errors

Hi,

Enclosed are 4 more potential bugs where user pointer is dereferenced.
Please note the word "Callstack" in the bug report doesn't always mean a
call. We link functions together if they are assigned to the same struct
field.

Please confirm or clarify. Thanks!

-Junfeng

---------------------------------------------------------
[BUG] at least bad programming practice. file_operations.write ->
cm_write -> trans_ac3. write can take tainted. write can take tainted
inputs. the pointer is vefied in cm_write
/home/junfeng/linux-2.5.63/sound/oss/cmpci.c:593:trans_ac3:
ERROR:TAINTED:593:593: dereferencing tainted ptr 'src' [Callstack:
/home/junfeng/linux-2.5.63/fs/read_write.c:307:vfs_write((tainted
1)(tainted 2)) ->
/home/junfeng/linux-2.5.63/fs/read_write.c:241:cm_write((tainted
1)(tainted 2)) ->
/home/junfeng/linux-2.5.63/sound/oss/cmpci.c:1662:trans_ac3((tainted
2))]

unsigned long data;
unsigned long *dst = (unsigned long *) dest;
unsigned short *src = (unsigned short *)source;

do {
Error --->
data = (unsigned long) *src++;
data <<= 12; // ok for 16-bit data
if (s->spdif_counter == 2 || s->spdif_counter == 3)
data |= 0x40000000; // indicate AC-3 raw
data
---------------------------------------------------------
[BUG] at least bad programming practice. file_opetations.ioctl ->
aac_cfg_ioctl -> aac_do_ioctl -> close_getadapter_fib ->
aac_close_fib_context. All other functions called by aac_do_ioctl assume
arg is a user pointer. It is unknown what will happen.
/home/junfeng/linux-2.5.63/drivers/scsi/aacraid/commctrl.c:277:aac_close_fib_context:
ERROR:TAINTED:277:277: dereferencing tainted ptr 'fibctx' [Callstack:
/home/junfeng/linux-2.5.63/drivers/scsi/sg.c:1002:aac_cfg_ioctl((tainted
3)) ->
/home/junfeng/linux-2.5.63/drivers/scsi/aacraid/linit.c:671:aac_do_ioctl((tainted
2)) ->
/home/junfeng/linux-2.5.63/drivers/scsi/aacraid/commctrl.c:421:close_getadapter_fib((tainted
1)) ->
/home/junfeng/linux-2.5.63/drivers/scsi/aacraid/commctrl.c:348:aac_close_fib_context((tainted
1))]

while (!list_empty(&fibctx->fibs)) {
struct list_head * entry;
/*
* Pull the next fib from the fibs
*/
Error --->
entry = fibctx->fibs.next;
list_del(entry);
fib = list_entry(entry, struct hw_fib, header.FibLinks);
fibctx->count--;
---------------------------------------------------------
[BUG] at least bad programming practice. zoran_read and vbi_read are
both assigned to video_device.read, while zoran_read assumes "buf" is
tainted. The pointer is verified by access_ok
/home/junfeng/linux-2.5.63/drivers/media/video/zr36120.c:1698:vbi_read:
ERROR:TAINTED:1698:1698: dereferencing tainted ptr 'optr' [Callstack:
/home/junfeng/linux-2.5.63/drivers/media/video/zr36120.c:934:vbi_read((tainted
1))]

{
/* copy to doubled data to userland */
for (x=0; optr+1<eptr && x<-done->w; x++)
{
unsigned char a = iptr[x*2];
Error --->
*optr++ = a;
*optr++ = a;
}
/* and clear the rest of the line */
---------------------------------------------------------
[BUG] at least bad programming practice. calls access_ok on
qv.packet_sizes, then passed qv.packet_sizes into
initialize_dma_it_prg_var_packet_queue.
/home/junfeng/linux-2.5.63/drivers/ieee1394/video1394.c:668:initialize_dma_it_prg_var_packet_queue:
ERROR:TAINTED:668:668: dereferencing tainted ptr 'packet_sizes + i * 4'
[Callstack:
/home/junfeng/linux-2.5.63/drivers/ieee1394/video1394.c:1047:initialize_dma_it_prg_var_packet_queue((tainted
2))]

for (i = 0; i < d->nb_cmd; i++) {
unsigned int size;
if (packet_sizes[i] > d->packet_size) {
size = d->packet_size;
} else {
Error --->
size = packet_sizes[i];
}
it_prg[i].data[1] = cpu_to_le32(size << 16);
it_prg[i].end.control = cpu_to_le32(DMA_CTL_OUTPUT_LAST
| DMA_CTL_BRANCH);
-
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