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| author | Johannes Berg <johannes.berg@intel.com> | 2022-11-25 14:36:57 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-12-08 13:23:56 +0300 |
| commit | 9e6b79a3cd17620d467311b30d56f2648f6880aa (patch) | |
| tree | ab36a7dac59517d03f1c01fda10c0e5cc95a9376 /net/wireless | |
| parent | 6922948c2ec1cc45b11acb8ec2eeb3a8353d572b (diff) | |
| download | linux-9e6b79a3cd17620d467311b30d56f2648f6880aa.tar.xz | |
wifi: cfg80211: fix buffer overflow in elem comparison
[ Upstream commit 9f16b5c82a025cd4c864737409234ddc44fb166a ]
For vendor elements, the code here assumes that 5 octets
are present without checking. Since the element itself is
already checked to fit, we only need to check the length.
Reported-and-tested-by: Sönke Huster <shuster@seemoo.tu-darmstadt.de>
Fixes: 0b8fb8235be8 ("cfg80211: Parsing of Multiple BSSID information in scanning")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/wireless')
| -rw-r--r-- | net/wireless/scan.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/wireless/scan.c b/net/wireless/scan.c index 15119c49c093..8102ee7b2047 100644 --- a/net/wireless/scan.c +++ b/net/wireless/scan.c @@ -330,7 +330,8 @@ static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen, * determine if they are the same ie. */ if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) { - if (!memcmp(tmp_old + 2, tmp + 2, 5)) { + if (tmp_old[1] >= 5 && tmp[1] >= 5 && + !memcmp(tmp_old + 2, tmp + 2, 5)) { /* same vendor ie, copy from * subelement */ |