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64 lines
2.4 KiB
Diff
64 lines
2.4 KiB
Diff
From: Arend Van Spriel <arend.vanspriel@broadcom.com>
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Date: Tue, 12 Sep 2017 10:47:53 +0200
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Subject: [PATCH] brcmfmac: add length check in brcmf_cfg80211_escan_handler()
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Upon handling the firmware notification for scans the length was
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checked properly and may result in corrupting kernel heap memory
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due to buffer overruns. This fix addresses CVE-2017-0786.
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Cc: stable@vger.kernel.org # v4.0.x
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Cc: Kevin Cernekee <cernekee@chromium.org>
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Reviewed-by: Hante Meuleman <hante.meuleman@broadcom.com>
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Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
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Reviewed-by: Franky Lin <franky.lin@broadcom.com>
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Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
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Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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---
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--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
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+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
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@@ -3088,6 +3088,7 @@ brcmf_cfg80211_escan_handler(struct brcm
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struct brcmf_cfg80211_info *cfg = ifp->drvr->config;
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s32 status;
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struct brcmf_escan_result_le *escan_result_le;
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+ u32 escan_buflen;
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struct brcmf_bss_info_le *bss_info_le;
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struct brcmf_bss_info_le *bss = NULL;
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u32 bi_length;
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@@ -3104,11 +3105,23 @@ brcmf_cfg80211_escan_handler(struct brcm
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if (status == BRCMF_E_STATUS_PARTIAL) {
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brcmf_dbg(SCAN, "ESCAN Partial result\n");
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+ if (e->datalen < sizeof(*escan_result_le)) {
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+ brcmf_err("invalid event data length\n");
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+ goto exit;
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+ }
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escan_result_le = (struct brcmf_escan_result_le *) data;
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if (!escan_result_le) {
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brcmf_err("Invalid escan result (NULL pointer)\n");
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goto exit;
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}
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+ escan_buflen = le32_to_cpu(escan_result_le->buflen);
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+ if (escan_buflen > BRCMF_ESCAN_BUF_SIZE ||
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+ escan_buflen > e->datalen ||
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+ escan_buflen < sizeof(*escan_result_le)) {
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+ brcmf_err("Invalid escan buffer length: %d\n",
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+ escan_buflen);
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+ goto exit;
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+ }
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if (le16_to_cpu(escan_result_le->bss_count) != 1) {
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brcmf_err("Invalid bss_count %d: ignoring\n",
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escan_result_le->bss_count);
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@@ -3125,9 +3138,8 @@ brcmf_cfg80211_escan_handler(struct brcm
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}
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bi_length = le32_to_cpu(bss_info_le->length);
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- if (bi_length != (le32_to_cpu(escan_result_le->buflen) -
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- WL_ESCAN_RESULTS_FIXED_SIZE)) {
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- brcmf_err("Invalid bss_info length %d: ignoring\n",
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+ if (bi_length != escan_buflen - WL_ESCAN_RESULTS_FIXED_SIZE) {
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+ brcmf_err("Ignoring invalid bss_info length: %d\n",
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bi_length);
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goto exit;
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}
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