This is a note to let you know that I've just added the patch titled
ethtool: Allow zero-length register dumps again
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ethtool-allow-zero-length-register-dumps-again.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 67ae7cf1eeda777f79259c4c6cb17a0bd28dee71 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <[email protected]>
Date: Thu, 21 Jul 2011 15:25:30 -0700
Subject: ethtool: Allow zero-length register dumps again
From: Ben Hutchings <[email protected]>
commit 67ae7cf1eeda777f79259c4c6cb17a0bd28dee71 upstream.
Some drivers (ab)use the ethtool_ops::get_regs operation to expose
only a hardware revision ID. Commit
a77f5db361ed9953b5b749353ea2c7fed2bf8d93 ('ethtool: Allocate register
dump buffer with vmalloc()') had the side-effect of breaking these, as
vmalloc() returns a null pointer for size=0 whereas kmalloc() did not.
For backward-compatibility, allow zero-length dumps again.
Reported-by: Kalle Valo <[email protected]>
Signed-off-by: Ben Hutchings <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/core/ethtool.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -1227,7 +1227,7 @@ static int ethtool_get_regs(struct net_d
regs.len = reglen;
regbuf = vzalloc(reglen);
- if (!regbuf)
+ if (reglen && !regbuf)
return -ENOMEM;
ops->get_regs(dev, ®s, regbuf);
@@ -1236,7 +1236,7 @@ static int ethtool_get_regs(struct net_d
if (copy_to_user(useraddr, ®s, sizeof(regs)))
goto out;
useraddr += offsetof(struct ethtool_regs, data);
- if (copy_to_user(useraddr, regbuf, regs.len))
+ if (regbuf && copy_to_user(useraddr, regbuf, regs.len))
goto out;
ret = 0;
Patches currently in stable-queue which might be from [email protected]
are
queue-3.0/ethtool-allow-zero-length-register-dumps-again.patch
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