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| author | Felix Fietkau <nbd@nbd.name> | 2017-10-16 12:46:58 +0200 |
|---|---|---|
| committer | Felix Fietkau <nbd@nbd.name> | 2017-10-16 13:02:04 +0200 |
| commit | bff16304b0bf5ebc98a6599235cc19512d051888 (patch) | |
| tree | 2d3486952f8d1e240fe9d73022295c6bfe118118 | |
| parent | fa0b5fce1f53c3520cacff49e9d371fb2c5c3685 (diff) | |
| download | mtk-20170518-bff16304b0bf5ebc98a6599235cc19512d051888.zip mtk-20170518-bff16304b0bf5ebc98a6599235cc19512d051888.tar.gz mtk-20170518-bff16304b0bf5ebc98a6599235cc19512d051888.tar.bz2 | |
brcmfmac: backport length check in brcmf_cfg80211_escan_handler()
Fixes CVE-2017-0786
Signed-off-by: Felix Fietkau <nbd@nbd.name>
| -rw-r--r-- | package/kernel/mac80211/patches/326-brcmfmac-add-length-check-in-brcmf_cfg80211_escan_ha.patch | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/326-brcmfmac-add-length-check-in-brcmf_cfg80211_escan_ha.patch b/package/kernel/mac80211/patches/326-brcmfmac-add-length-check-in-brcmf_cfg80211_escan_ha.patch new file mode 100644 index 0000000..63c867a --- /dev/null +++ b/package/kernel/mac80211/patches/326-brcmfmac-add-length-check-in-brcmf_cfg80211_escan_ha.patch @@ -0,0 +1,63 @@ +From: Arend Van Spriel <arend.vanspriel@broadcom.com> +Date: Tue, 12 Sep 2017 10:47:53 +0200 +Subject: [PATCH] brcmfmac: add length check in brcmf_cfg80211_escan_handler() + +Upon handling the firmware notification for scans the length was +checked properly and may result in corrupting kernel heap memory +due to buffer overruns. This fix addresses CVE-2017-0786. + +Cc: stable@vger.kernel.org # v4.0.x +Cc: Kevin Cernekee <cernekee@chromium.org> +Reviewed-by: Hante Meuleman <hante.meuleman@broadcom.com> +Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com> +Reviewed-by: Franky Lin <franky.lin@broadcom.com> +Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com> +Signed-off-by: Kalle Valo <kvalo@codeaurora.org> +--- + +--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c ++++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c +@@ -3088,6 +3088,7 @@ brcmf_cfg80211_escan_handler(struct brcm + struct brcmf_cfg80211_info *cfg = ifp->drvr->config; + s32 status; + struct brcmf_escan_result_le *escan_result_le; ++ u32 escan_buflen; + struct brcmf_bss_info_le *bss_info_le; + struct brcmf_bss_info_le *bss = NULL; + u32 bi_length; +@@ -3104,11 +3105,23 @@ brcmf_cfg80211_escan_handler(struct brcm + + if (status == BRCMF_E_STATUS_PARTIAL) { + brcmf_dbg(SCAN, "ESCAN Partial result\n"); ++ if (e->datalen < sizeof(*escan_result_le)) { ++ brcmf_err("invalid event data length\n"); ++ goto exit; ++ } + escan_result_le = (struct brcmf_escan_result_le *) data; + if (!escan_result_le) { + brcmf_err("Invalid escan result (NULL pointer)\n"); + goto exit; + } ++ escan_buflen = le32_to_cpu(escan_result_le->buflen); ++ if (escan_buflen > BRCMF_ESCAN_BUF_SIZE || ++ escan_buflen > e->datalen || ++ escan_buflen < sizeof(*escan_result_le)) { ++ brcmf_err("Invalid escan buffer length: %d\n", ++ escan_buflen); ++ goto exit; ++ } + if (le16_to_cpu(escan_result_le->bss_count) != 1) { + brcmf_err("Invalid bss_count %d: ignoring\n", + escan_result_le->bss_count); +@@ -3125,9 +3138,8 @@ brcmf_cfg80211_escan_handler(struct brcm + } + + bi_length = le32_to_cpu(bss_info_le->length); +- if (bi_length != (le32_to_cpu(escan_result_le->buflen) - +- WL_ESCAN_RESULTS_FIXED_SIZE)) { +- brcmf_err("Invalid bss_info length %d: ignoring\n", ++ if (bi_length != escan_buflen - WL_ESCAN_RESULTS_FIXED_SIZE) { ++ brcmf_err("Ignoring invalid bss_info length: %d\n", + bi_length); + goto exit; + } |