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authorStanislav Brabec <sbrabec@suse.cz>2009-12-09 08:00:22 +0300
committerDavid S. Miller <davem@davemloft.net>2009-12-09 08:00:22 +0300
commite0188829cb724e7d12a2d4e343b368ff1d6e1471 (patch)
tree4aa935073040b11f6a8e2f55451fa80a8ffb3028 /drivers/net/b44.c
parent77722b177a1606669c0b95dde03347e37d13b8fe (diff)
downloadlinux-e0188829cb724e7d12a2d4e343b368ff1d6e1471.tar.xz
b44 WOL setup: one-bit-off stack corruption kernel panic fix
About 50% of shutdowns of b44 Ethernet adapter ends by kernel panic with kernels compiled with stack-protector. Checking b44_magic_pattern() return values, one call of b44_magic_pattern() returns 127. It means, that set_bit(128, pmask) was called on line 1509. It means that bit 0 of 17th byte of pmask was overwritten. But pmask has only 16 bytes. Stack corruption happens. It seems that set_bit() on line 1509 always writes one bit off. The fix does not only solve the stack corruption, but also makes Wake On LAN working on my onboard B44 on Asus A7V-333X mainboard. It seems that this problem affects all kernel versions since commit 725ad800 ([PATCH] b44: add wol for old nic) on 2006-06-20. Signed-off-by: Stanislav Brabec <sbrabec@suse.cz> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/b44.c')
-rw-r--r--drivers/net/b44.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/net/b44.c b/drivers/net/b44.c
index 2a9132343b66..4869adb69586 100644
--- a/drivers/net/b44.c
+++ b/drivers/net/b44.c
@@ -1505,8 +1505,7 @@ static int b44_magic_pattern(u8 *macaddr, u8 *ppattern, u8 *pmask, int offset)
for (k = 0; k< ethaddr_bytes; k++) {
ppattern[offset + magicsync +
(j * ETH_ALEN) + k] = macaddr[k];
- len++;
- set_bit(len, (unsigned long *) pmask);
+ set_bit(len++, (unsigned long *) pmask);
}
}
return len - 1;