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qcacmn: Fix invalid buffer access in p2p mgmt tx processing

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While transmitting p2p mgmt action tx frame, there is no check for
minimum payload length which can result in buffer over-read.

To avoid this, add check for header and payload length.

Change-Id: I9e3b4ef0878d934f3425d91bb6ea4a37b1892a3d
CRs-Fixed: 2103849
This commit is contained in:
Rajeev Kumar Sirasanagandla
2017-09-01 18:48:36 +05:30
committed by snandini
parent 21f4cdaee2
commit 3cbcfa519f
1 changed files with 16 additions and 4 deletions
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18
umac/p2p/core/src/wlan_p2p_off_chan_tx.c
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@@ -145,6 +145,11 @@ static const uint8_t *p2p_get_p2pie_from_probe_rsp(
const uint8_t *tmp_p2p_ie; const uint8_t *tmp_p2p_ie;
uint16_t ie_len; uint16_t ie_len;
if (tx_ctx->buf_len <= PROBE_RSP_IE_OFFSET) {
p2p_err("Invalid header len for probe response");
return NULL;
}
ie = tx_ctx->buf + PROBE_RSP_IE_OFFSET; ie = tx_ctx->buf + PROBE_RSP_IE_OFFSET;
ie_len = tx_ctx->buf_len - PROBE_RSP_IE_OFFSET; ie_len = tx_ctx->buf_len - PROBE_RSP_IE_OFFSET;
p2p_ie = p2p_get_p2pie_ptr(ie, ie_len); p2p_ie = p2p_get_p2pie_ptr(ie, ie_len);
@@ -605,6 +610,11 @@ static QDF_STATUS p2p_get_frame_info(uint8_t *data_buf, uint32_t length,
p2p_init_frame_info(frame_info); p2p_init_frame_info(frame_info);
if (length < P2P_ACTION_OFFSET + 1) {
p2p_err("invalid p2p mgmt hdr len");
return QDF_STATUS_E_INVAL;
}
type = P2P_GET_TYPE_FRM_FC(buf[0]); type = P2P_GET_TYPE_FRM_FC(buf[0]);
sub_type = P2P_GET_SUBTYPE_FRM_FC(buf[0]); sub_type = P2P_GET_SUBTYPE_FRM_FC(buf[0]);
if (type != P2P_FRAME_MGMT) { if (type != P2P_FRAME_MGMT) {
@@ -633,7 +643,8 @@ static QDF_STATUS p2p_get_frame_info(uint8_t *data_buf, uint32_t length,
frame_info->sub_type = P2P_MGMT_ACTION; frame_info->sub_type = P2P_MGMT_ACTION;
buf += P2P_ACTION_OFFSET; buf += P2P_ACTION_OFFSET;
if (buf[0] == P2P_PUBLIC_ACTION_FRAME && if (length > P2P_PUBLIC_ACTION_FRAME_TYPE_OFFSET &&
buf[0] == P2P_PUBLIC_ACTION_FRAME &&
buf[1] == P2P_PUBLIC_ACTION_VENDOR_SPECIFIC && buf[1] == P2P_PUBLIC_ACTION_VENDOR_SPECIFIC &&
!qdf_mem_cmp(&buf[2], P2P_OUI, P2P_OUI_SIZE)) { !qdf_mem_cmp(&buf[2], P2P_OUI, P2P_OUI_SIZE)) {
buf = data_buf + buf = data_buf +
@@ -644,7 +655,8 @@ static QDF_STATUS p2p_get_frame_info(uint8_t *data_buf, uint32_t length,
P2P_PUBLIC_ACTION_NOT_SUPPORT; P2P_PUBLIC_ACTION_NOT_SUPPORT;
else else
frame_info->public_action_type = action_type; frame_info->public_action_type = action_type;
} else if (buf[0] == P2P_ACTION_VENDOR_SPECIFIC_CATEGORY && } else if (length > P2P_ACTION_FRAME_TYPE_OFFSET &&
buf[0] == P2P_ACTION_VENDOR_SPECIFIC_CATEGORY &&
!qdf_mem_cmp(&buf[1], P2P_OUI, P2P_OUI_SIZE)) { !qdf_mem_cmp(&buf[1], P2P_OUI, P2P_OUI_SIZE)) {
buf = data_buf + buf = data_buf +
P2P_ACTION_FRAME_TYPE_OFFSET; P2P_ACTION_FRAME_TYPE_OFFSET;
@@ -1397,7 +1409,7 @@ static QDF_STATUS p2p_execute_tx_action_frame(
*/ */
p2p_populate_mac_header(tx_ctx); p2p_populate_mac_header(tx_ctx);
if ((noa_len > 0) if ((noa_len > 0) && p2p_ie
&& (noa_len < (P2P_MAX_NOA_ATTR_LEN + && (noa_len < (P2P_MAX_NOA_ATTR_LEN +
P2P_IE_HEADER_LEN))) { P2P_IE_HEADER_LEN))) {
/* Add 2 bytes for length and Arribute field */ /* Add 2 bytes for length and Arribute field */