Re: [PATCH 08/12] pci: Fix silent truncation of pcie_aer_inject_error argument

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Markus Armbruster (armbru@redhat.com) wrote:
> PCI AER error status is 32 bit.  When the HMP command's second
> argument parses as a number, values greater than ULONG_MAX get
> rejected, but values between UINT32_MAX+1 and ULONG_MAX get silently
> truncated.  Fix to reject them, too.
> 
> While there, use qemu_strtoul() instead of strtoul() so checkpatch.pl
> won't complain.

WOuldn't qemu_strtoui do the num > UINT32_MAX for you?

Dave

> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> ---
>  hw/pci/pcie_aer.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/pci/pcie_aer.c b/hw/pci/pcie_aer.c
> index eff62f3945..ccca5a81cc 100644
> --- a/hw/pci/pcie_aer.c
> +++ b/hw/pci/pcie_aer.c
> @@ -30,6 +30,7 @@
>  #include "hw/pci/pci_bus.h"
>  #include "hw/pci/pcie_regs.h"
>  #include "qapi/error.h"
> +#include "qemu/cutils.h"
>  
>  //#define DEBUG_PCIE
>  #ifdef DEBUG_PCIE
> @@ -963,6 +964,7 @@ static int do_pcie_aer_inject_error(Monitor *mon,
>      const char *id = qdict_get_str(qdict, "id");
>      const char *error_name;
>      uint32_t error_status;
> +    unsigned long num;
>      bool correctable;
>      PCIDevice *dev;
>      PCIEAERErr err;
> @@ -983,14 +985,14 @@ static int do_pcie_aer_inject_error(Monitor *mon,
>  
>      error_name = qdict_get_str(qdict, "error_status");
>      if (pcie_aer_parse_error_string(error_name, &error_status, &correctable)) {
> -        char *e = NULL;
> -        error_status = strtoul(error_name, &e, 0);
> -        correctable = qdict_get_try_bool(qdict, "correctable", false);
> -        if (!e || *e != '\0') {
> +        if (qemu_strtoul(error_name, NULL, 0, &num) < 0
> +            || num > UINT32_MAX) {
>              monitor_printf(mon, "invalid error status value. \"%s\"",
>                             error_name);
>              return -EINVAL;
>          }
> +        error_status = num;
> +        correctable = qdict_get_try_bool(qdict, "correctable", false);
>      }
>      err.status = error_status;
>      err.source_id = pci_requester_id(dev);
> -- 
> 2.37.3
> 
-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK