On Wed 08 Feb 02:33 PST 2017, Stanimir Varbanov wrote:
> Hi Bjorn,
>
> On 01/30/2017 06:55 PM, Bjorn Andersson wrote:
[..]
> > +int qcom_mdt_load(struct device *dev, const struct firmware *fw,
[..]
> > + size_t offset;
[..]
> > + for (i = 0; i < ehdr->e_phnum; i++) {
> > + phdr = &phdrs[i];
> > +
> > + if (!mdt_phdr_valid(phdr))
> > continue;
> >
> > - ptr = rproc_da_to_va(rproc, phdr->p_paddr, phdr->p_memsz);
> > - if (!ptr) {
> > - dev_err(&rproc->dev, "segment outside memory range\n");
> > + offset = phdr->p_paddr - mem_reloc;
>
> Shouldn't 'offset' variable be of signed type i.e. ssize_t?
It should, as a small "negative" value will wrap back into the
acceptable range of the second part of the check below. I got another
report of this as well yesterday, so I will prepare a patch for this.
> Also p_paddr is of type Elf32_Addr and mem_reloc is of type
> phys_addr_t which on 64bit systems is 64bit long, I think it should be
> better to make mem_reloc of the same type as p_paddr.
>
If I remember what the C standard says, mem_reloc would in the 64-bit
case have higher "rank" and the type of p_paddr would therefor be
converted to the type of mem_reloc (i.e. u64) and the result would be
stored in a 64 bit type. But it's been a while and I can't find my C
reference manual right now...
Casting mem_reloc to the type of p_paddr would cause invalid results in
the event that the system is configured to actually load a relocatable
blob into memory above 4GB.
> > + if (offset < 0 || offset + phdr->p_memsz > mem_size) {
> > + dev_err(dev, "segment outside memory range\n");
> > ret = -EINVAL;
> > break;
> > }
> >
> > + ptr = mem_region + offset;
> > +
> > if (phdr->p_filesz) {
> > sprintf(fw_name + fw_name_len - 3, "b%02d", i);
> > - ret = request_firmware(&seg_fw, fw_name, &rproc->dev);
> > + ret = request_firmware(&seg_fw, fw_name, dev);
> > if (ret) {
> > - dev_err(&rproc->dev, "failed to load %s\n",
> > - fw_name);
> > + dev_err(dev, "failed to load %s\n", fw_name);
> > break;
> > }
> >
>
Regards,
Bjorn
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