mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-11 08:54:28 -05:00
121 lines
4.2 KiB
Diff
121 lines
4.2 KiB
Diff
From 068427b76963929b220a4be40cdf77856374df55 Mon Sep 17 00:00:00 2001
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From: Sudhir Kohalli <sudhir.kohalli@broadcom.com>
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Date: Fri, 4 Nov 2016 12:09:19 -0700
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Subject: [PATCH] net: wireless: bcmdhd: Security V: memory overflow in wifi
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driver function __dhd_apf_add_filter
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In order to fix the memory overflow added a check
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for APF program_len to verify if the program_len is
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more than the MAX program length. If the APF program_len
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is more than the MAX APF program_len then parse an error.
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This check will avoid memory oveflow issue happening
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in __dhd_apf_add_filter API. APF referes to Android Packet
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filter.
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Bug: 32219121
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Change-Id: Ibe468dcb51ec4f35c64da4bdc7296130bf145f13
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Signed-off-by: Sudhir Kohalli <sudhir.kohalli@broadcom.com>
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---
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drivers/net/wireless/bcmdhd/dhd_linux.c | 13 ++++++++++-
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drivers/net/wireless/bcmdhd/include/wlioctl.h | 2 ++
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drivers/net/wireless/bcmdhd/wl_cfgvendor.c | 31 +++++++++++++++++++++++++--
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3 files changed, 43 insertions(+), 3 deletions(-)
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diff --git a/drivers/net/wireless/bcmdhd/dhd_linux.c b/drivers/net/wireless/bcmdhd/dhd_linux.c
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index 4ce5a2f4663d3..2fd2934a7e851 100644
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--- a/drivers/net/wireless/bcmdhd/dhd_linux.c
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+++ b/drivers/net/wireless/bcmdhd/dhd_linux.c
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@@ -9039,13 +9039,24 @@ __dhd_apf_add_filter(struct net_device *ndev, uint32 filter_id,
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}
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cmd_len = sizeof(cmd);
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+
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+ /* Check if the program_len is more than the expected len
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+ * and if program is initialized to NULL return here.
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+ */
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+ if ((program_len > WL_APF_PROGRAM_MAX_SIZE) ||
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+ (program == NULL)) {
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+ DHD_ERROR(("%s Invalid program_len: %d, program: %pK\n",
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+ __func__, program_len, program));
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+ return -EINVAL;
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+ }
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buf_len = cmd_len + WL_PKT_FILTER_FIXED_LEN +
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WL_APF_PROGRAM_FIXED_LEN + program_len;
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kflags = in_atomic() ? GFP_ATOMIC : GFP_KERNEL;
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buf = kzalloc(buf_len, kflags);
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if (unlikely(!buf)) {
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- DHD_ERROR(("%s: MALLOC failure, %d bytes\n", __FUNCTION__, buf_len));
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+ DHD_ERROR(("%s: MALLOC failure, %d bytes\n", __func__,
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+ buf_len));
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return -ENOMEM;
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}
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diff --git a/drivers/net/wireless/bcmdhd/include/wlioctl.h b/drivers/net/wireless/bcmdhd/include/wlioctl.h
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index 50de89bc5a9c6..808a0bfc3e108 100644
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--- a/drivers/net/wireless/bcmdhd/include/wlioctl.h
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+++ b/drivers/net/wireless/bcmdhd/include/wlioctl.h
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@@ -3291,6 +3291,8 @@ typedef struct wl_tcp_keep_set {
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OFFSETOF(wl_pkt_filter_pattern_listel_t, mask_and_data)
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#define WL_APF_INTERNAL_VERSION 1
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+/* This will be MAX allowable APF program size */
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+#define WL_APF_PROGRAM_MAX_SIZE (2 * 1024)
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#define WL_APF_PROGRAM_FIXED_LEN OFFSETOF(wl_apf_program_t, instrs)
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#define WL_APF_PROGRAM_LEN(apf_program) \
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(apf_program->instr_len * sizeof(apf_program->instrs[0]))
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diff --git a/drivers/net/wireless/bcmdhd/wl_cfgvendor.c b/drivers/net/wireless/bcmdhd/wl_cfgvendor.c
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index d578026885619..5be16a72aa43f 100644
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--- a/drivers/net/wireless/bcmdhd/wl_cfgvendor.c
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+++ b/drivers/net/wireless/bcmdhd/wl_cfgvendor.c
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@@ -2722,12 +2722,33 @@ wl_cfgvendor_apf_set_filter(struct wiphy *wiphy,
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int ret, tmp, type;
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gfp_t kflags;
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- /* assumption: length attribute must come first */
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+ if (len <= 0) {
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+ WL_ERR((" Invalid len : %d\n", len));
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+ ret = -EINVAL;
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+ goto exit;
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+ }
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nla_for_each_attr(iter, data, len, tmp) {
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type = nla_type(iter);
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switch (type) {
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case APF_ATTRIBUTE_PROGRAM_LEN:
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- program_len = nla_get_u32(iter);
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+ /* check if the iter is valid and program
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+ * length is not already initialized.
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+ */
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+ if (nla_len(iter) == sizeof(uint32) &&
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+ !program_len) {
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+ program_len = nla_get_u32(iter);
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+ } else {
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+ ret = -EINVAL;
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+ goto exit;
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+ }
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+
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+ if (program_len >
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+ WL_APF_PROGRAM_MAX_SIZE) {
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+ WL_ERR(("program len is more "));
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+ WL_ERR(("than expected len\n"));
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+ ret = -EINVAL;
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+ goto exit;
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+ }
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if (unlikely(!program_len)) {
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WL_ERR(("zero program length\n"));
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ret = -EINVAL;
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@@ -2740,6 +2761,12 @@ wl_cfgvendor_apf_set_filter(struct wiphy *wiphy,
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ret = -EINVAL;
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goto exit;
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}
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+ if (nla_len(iter) != program_len) {
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+ WL_ERR(("program_len is not same\n"));
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+ ret = -EINVAL;
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+ goto exit;
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+ }
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+
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kflags = in_atomic() ? GFP_ATOMIC : GFP_KERNEL;
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program = kzalloc(program_len, kflags);
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if (unlikely(!program)) {
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