From: Johannes Berg Date: Wed, 29 Oct 2008 10:43:32 +0000 (+0100) Subject: libertas: fix buffer overrun X-Git-Tag: v2.6.28-rc3~3^2~13^2~5 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=48735d8d8bd701b1e0cd3d49c21e5e385ddcb077;p=linux-2.6-omap-h63xx.git libertas: fix buffer overrun If somebody sends an invalid beacon/probe response, that can trash the whole BSS descriptor. The descriptor is, luckily, large enough so that it cannot scribble past the end of it; it's well above 400 bytes long. Signed-off-by: Johannes Berg Cc: stable@kernel.org [2.6.24-2.6.27, bug present in some form since driver was added (2.6.22)] Signed-off-by: John W. Linville --- diff --git a/drivers/net/wireless/libertas/scan.c b/drivers/net/wireless/libertas/scan.c index 8f66903641b..22c4c611052 100644 --- a/drivers/net/wireless/libertas/scan.c +++ b/drivers/net/wireless/libertas/scan.c @@ -598,8 +598,8 @@ static int lbs_process_bss(struct bss_descriptor *bss, switch (elem->id) { case MFIE_TYPE_SSID: - bss->ssid_len = elem->len; - memcpy(bss->ssid, elem->data, elem->len); + bss->ssid_len = min_t(int, 32, elem->len); + memcpy(bss->ssid, elem->data, bss->ssid_len); lbs_deb_scan("got SSID IE: '%s', len %u\n", escape_essid(bss->ssid, bss->ssid_len), bss->ssid_len);