From: Takashi Iwai tiwai@suse.de
commit 69ae4f6aac1578575126319d3f55550e7e440449 upstream.
A few places in mwifiex_uap_parse_tail_ies() perform memcpy() unconditionally, which may lead to either buffer overflow or read over boundary.
This patch addresses the issues by checking the read size and the destination size at each place more properly. Along with the fixes, the patch cleans up the code slightly by introducing a temporary variable for the token size, and unifies the error path with the standard goto statement.
Reported-by: huangwen huangwen@venustech.com.cn Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Kalle Valo kvalo@codeaurora.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/net/wireless/mwifiex/ie.c | 45 +++++++++++++++++++++++++------------- 1 file changed, 30 insertions(+), 15 deletions(-)
--- a/drivers/net/wireless/mwifiex/ie.c +++ b/drivers/net/wireless/mwifiex/ie.c @@ -328,6 +328,8 @@ static int mwifiex_uap_parse_tail_ies(st struct ieee80211_vendor_ie *vendorhdr; u16 gen_idx = MWIFIEX_AUTO_IDX_MASK, ie_len = 0; int left_len, parsed_len = 0; + unsigned int token_len; + int err = 0;
if (!info->tail || !info->tail_len) return 0; @@ -343,6 +345,12 @@ static int mwifiex_uap_parse_tail_ies(st */ while (left_len > sizeof(struct ieee_types_header)) { hdr = (void *)(info->tail + parsed_len); + token_len = hdr->len + sizeof(struct ieee_types_header); + if (token_len > left_len) { + err = -EINVAL; + goto out; + } + switch (hdr->element_id) { case WLAN_EID_SSID: case WLAN_EID_SUPP_RATES: @@ -356,13 +364,16 @@ static int mwifiex_uap_parse_tail_ies(st case WLAN_EID_VENDOR_SPECIFIC: break; default: - memcpy(gen_ie->ie_buffer + ie_len, hdr, - hdr->len + sizeof(struct ieee_types_header)); - ie_len += hdr->len + sizeof(struct ieee_types_header); + if (ie_len + token_len > IEEE_MAX_IE_SIZE) { + err = -EINVAL; + goto out; + } + memcpy(gen_ie->ie_buffer + ie_len, hdr, token_len); + ie_len += token_len; break; } - left_len -= hdr->len + sizeof(struct ieee_types_header); - parsed_len += hdr->len + sizeof(struct ieee_types_header); + left_len -= token_len; + parsed_len += token_len; }
/* parse only WPA vendor IE from tail, WMM IE is configured by @@ -372,15 +383,17 @@ static int mwifiex_uap_parse_tail_ies(st WLAN_OUI_TYPE_MICROSOFT_WPA, info->tail, info->tail_len); if (vendorhdr) { - memcpy(gen_ie->ie_buffer + ie_len, vendorhdr, - vendorhdr->len + sizeof(struct ieee_types_header)); - ie_len += vendorhdr->len + sizeof(struct ieee_types_header); + token_len = vendorhdr->len + sizeof(struct ieee_types_header); + if (ie_len + token_len > IEEE_MAX_IE_SIZE) { + err = -EINVAL; + goto out; + } + memcpy(gen_ie->ie_buffer + ie_len, vendorhdr, token_len); + ie_len += token_len; }
- if (!ie_len) { - kfree(gen_ie); - return 0; - } + if (!ie_len) + goto out;
gen_ie->ie_index = cpu_to_le16(gen_idx); gen_ie->mgmt_subtype_mask = cpu_to_le16(MGMT_MASK_BEACON | @@ -390,13 +403,15 @@ static int mwifiex_uap_parse_tail_ies(st
if (mwifiex_update_uap_custom_ie(priv, gen_ie, &gen_idx, NULL, NULL, NULL, NULL)) { - kfree(gen_ie); - return -1; + err = -EINVAL; + goto out; }
priv->gen_idx = gen_idx; + + out: kfree(gen_ie); - return 0; + return err; }
/* This function parses different IEs-head & tail IEs, beacon IEs,