Il 06/09/2013 17:49, Alan Stern ha scritto:
> This patch fixes an out-of-bounds error in sd_read_cache_type(), found
> by Google's AddressSanitizer tool. When the loop ends, we know that
> "offset" lies beyond the end of the data in the buffer, so no Caching
> mode page was found. In theory it may be present, but the buffer size
> is limited to 512 bytes.
>
> Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> Reported-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
> CC: <stable@xxxxxxxxxxxxxxx>
Reviewed-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
>
> ---
>
>
> [as1709]
>
>
> drivers/scsi/sd.c | 11 +++--------
> 1 file changed, 3 insertions(+), 8 deletions(-)
>
> Index: usb-3.11/drivers/scsi/sd.c
> ===================================================================
> --- usb-3.11.orig/drivers/scsi/sd.c
> +++ usb-3.11/drivers/scsi/sd.c
> @@ -2419,14 +2419,9 @@ sd_read_cache_type(struct scsi_disk *sdk
> }
> }
>
> - if (modepage == 0x3F) {
> - sd_printk(KERN_ERR, sdkp, "No Caching mode page "
> - "present\n");
> - goto defaults;
> - } else if ((buffer[offset] & 0x3f) != modepage) {
> - sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
> - goto defaults;
> - }
> + sd_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
> + goto defaults;
> +
> Page_found:
> if (modepage == 8) {
> sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
>
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