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[PATCH] hostap_plx: fix CIS verification

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The length of the manfid CIS should be at least 4, and it's normally 4.
It's incorrect to require it to be at least 5.  This breaks support for
most (if not all) cards.

The right place to ensure that we don't access beyond the CIS buffer is
to strengthen another check.  Make sure that the next tuple begins at
least at the CIS buffer end (in which case we stop processing) or
before that.

Reported by ph35sm@free.fr

Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Pavel Roskin 2006-10-24 22:41:27 -04:00 committed by John W. Linville
parent aec41a0d02
commit 115e222d53
1 changed files with 2 additions and 2 deletions
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4
drivers/net/wireless/hostap/hostap_plx.c
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@ -364,7 +364,7 @@ static int prism2_plx_check_cis(void __iomem *attr_mem, int attr_len,
pos = 0;
while (pos < CIS_MAX_LEN - 1 && cis[pos] != CISTPL_END) {
if (pos + cis[pos + 1] >= CIS_MAX_LEN)
if (pos + 2 + cis[pos + 1] > CIS_MAX_LEN)
goto cis_error;
switch (cis[pos]) {
@ -391,7 +391,7 @@ static int prism2_plx_check_cis(void __iomem *attr_mem, int attr_len,
break;
case CISTPL_MANFID:
if (cis[pos + 1] < 5)
if (cis[pos + 1] < 4)
goto cis_error;
manfid1 = cis[pos + 2] + (cis[pos + 3] << 8);
manfid2 = cis[pos + 4] + (cis[pos + 5] << 8);