From e0a8ef4d7b4315bc4c1641fb3f3a7dfdfa6627b8 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Wed, 20 Feb 2019 11:30:47 +0100 Subject: [PATCH] brcmfmac: add basic validation of shared RAM address MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit While experimenting with firmware loading I ended up in a state of firmware reporting shared RAM address 0x04000001. It was causing: [ 94.448015] Unable to handle kernel paging request at virtual address cd680001 due to reading out of the mapped memory. This patch adds some basic validation to avoid kernel crashes due to the unexpected firmware behavior. Signed-off-by: Rafał Miłecki Acked-by: Arend van Spriel Signed-off-by: Kalle Valo --- drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c index 257f919c52ccd..58a6bc3793587 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c @@ -1560,6 +1560,12 @@ static int brcmf_pcie_download_fw_nvram(struct brcmf_pciedev_info *devinfo, brcmf_err(bus, "FW failed to initialize\n"); return -ENODEV; } + if (sharedram_addr < devinfo->ci->rambase || + sharedram_addr >= devinfo->ci->rambase + devinfo->ci->ramsize) { + brcmf_err(bus, "Invalid shared RAM address 0x%08x\n", + sharedram_addr); + return -ENODEV; + } brcmf_dbg(PCIE, "Shared RAM addr: 0x%08x\n", sharedram_addr); return (brcmf_pcie_init_share_ram_info(devinfo, sharedram_addr)); -- 2.30.2