The patch titled isight_firmware: Avoid crash on loading invalid firmware has been removed from the -mm tree. Its filename was isight_firmware-avoid-crash-on-loading-invalid-firmware.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: isight_firmware: Avoid crash on loading invalid firmware From: Matthew Garrett <mjg59@xxxxxxxxxxxxx> Different tools generate slightly different formats of the isight firmware. Ensure that the firmware buffer is not overrun, while still ensuring that the correct amount of data is written if trailing data is present. Signed-off-by: Matthew Garrett <mjg@xxxxxxxxxx> Report-by: Justin Mattock <justinmattock@xxxxxxxxx> Tested-by: Justin Mattock <justinmattock@xxxxxxxxx> Cc: Greg KH <greg@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/usb/misc/isight_firmware.c | 23 ++++++++++++++++------- 1 file changed, 16 insertions(+), 7 deletions(-) diff -puN drivers/usb/misc/isight_firmware.c~isight_firmware-avoid-crash-on-loading-invalid-firmware drivers/usb/misc/isight_firmware.c --- a/drivers/usb/misc/isight_firmware.c~isight_firmware-avoid-crash-on-loading-invalid-firmware +++ a/drivers/usb/misc/isight_firmware.c @@ -39,9 +39,12 @@ static int isight_firmware_load(struct u struct usb_device *dev = interface_to_usbdev(intf); int llen, len, req, ret = 0; const struct firmware *firmware; - unsigned char *buf; + unsigned char *buf = kmalloc(50, GFP_KERNEL); unsigned char data[4]; - char *ptr; + u8 *ptr; + + if (!buf) + return -ENOMEM; if (request_firmware(&firmware, "isight.fw", &dev->dev) != 0) { printk(KERN_ERR "Unable to load isight firmware\n"); @@ -59,7 +62,7 @@ static int isight_firmware_load(struct u goto out; } - while (1) { + while (ptr+4 <= firmware->data+firmware->size) { memcpy(data, ptr, 4); len = (data[0] << 8 | data[1]); req = (data[2] << 8 | data[3]); @@ -71,10 +74,14 @@ static int isight_firmware_load(struct u continue; for (; len > 0; req += 50) { - llen = len > 50 ? 50 : len; + llen = min(len, 50); len -= llen; - - buf = kmalloc(llen, GFP_KERNEL); + if (ptr+llen > firmware->data+firmware->size) { + printk(KERN_ERR + "Malformed isight firmware"); + ret = -ENODEV; + goto out; + } memcpy(buf, ptr, llen); ptr += llen; @@ -89,16 +96,18 @@ static int isight_firmware_load(struct u goto out; } - kfree(buf); } } + if (usb_control_msg (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, "\0", 1, 300) != 1) { printk(KERN_ERR "isight firmware loading completion failed\n"); ret = -ENODEV; } + out: + kfree(buf); release_firmware(firmware); return ret; } _ Patches currently in -mm which might be from mjg59@xxxxxxxxxxxxx are origin.patch linux-next.patch input-add-switch-for-dock-events.patch misc-add-hp-wmi-laptop-extras-driver.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html