From: Stefan Richter Date: Wed, 19 Mar 2008 21:05:02 +0000 (+0100) Subject: firewire: fw-ohci: catch self_id_count == 0 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=016bf3dfcf7c7fbad8f02e72b6e01d6773426f9d;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git firewire: fw-ohci: catch self_id_count == 0 fw_core_handle_bus_reset() incorrectly relied on the assumption that self_id_count > 0. We check early in fw-ohci and discard the self ID complete event if self_id_count == 0 because a valid event always has at least one self ID packet in it (the one of the local node). Hence treat self_id_count == 0 like any other kind of invalid self ID buffer. Signed-off-by: Stefan Richter Signed-off-by: Jarod Wilson --- diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c index 1f6f15f0dce2..0c4a07f11a59 100644 --- a/drivers/firewire/fw-ohci.c +++ b/drivers/firewire/fw-ohci.c @@ -1031,6 +1031,10 @@ static void bus_reset_tasklet(unsigned long data) * bit extra to get the actual number of self IDs. */ self_id_count = (reg >> 3) & 0x3ff; + if (self_id_count == 0) { + fw_notify("inconsistent self IDs\n"); + return; + } generation = (cond_le32_to_cpu(ohci->self_id_cpu[0]) >> 16) & 0xff; rmb();