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libertas: fix buffer overrun

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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 <johannes@sipsolutions.net>
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 <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2008-10-29 11:43:32 +01:00 committed by John W. Linville
parent 87bf24f3d2
commit 48735d8d8b
1 changed files with 2 additions and 2 deletions
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4
drivers/net/wireless/libertas/scan.c
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@ -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);