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Libertas: fix buffer overflow in lbs_get_essid()

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The libertas driver copies the SSID buffer back to the wireless core and
appends a trailing NULL character for termination. This is

a) unnecessary because the buffer is allocated with kzalloc and is hence
   already NULLed when this function is called, and

b) for priv->curbssparams.ssid_len == 32, it writes back one byte too
   much which causes memory corruptions.

Fix this by removing the extra write.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: Maithili Hinge <maithili@marvell.com>
Cc: Kiran Divekar <dkiran@marvell.com>
Cc: Michael Hirsch <m.hirsch@raumfeld.com>
Cc: netdev@vger.kernel.org
Cc: libertas-dev@lists.infradead.org
Cc: linux-wireless@lists.infradead.org
Cc: stable@kernel.org
Acked-by: Holger Schurig <holgerschurig@gmail.com>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Daniel Mack 2009-12-16 05:12:58 +01:00 committed by John W. Linville
parent 77ca7d9e2c
commit 45b2416891
1 changed files with 0 additions and 2 deletions
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2
drivers/net/wireless/libertas/wext.c
View file

@ -2025,10 +2025,8 @@ static int lbs_get_essid(struct net_device *dev, struct iw_request_info *info,
if (priv->connect_status == LBS_CONNECTED) {
memcpy(extra, priv->curbssparams.ssid,
priv->curbssparams.ssid_len);
extra[priv->curbssparams.ssid_len] = '\0';
} else {
memset(extra, 0, 32);
extra[priv->curbssparams.ssid_len] = '\0';
}
/*
* If none, we may want to get the one that was set