This is a note to let you know that I've just added the patch titled
rds: fix an integer overflow test in rds_info_getsockopt()
to the 3.14-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:
rds-fix-an-integer-overflow-test-in-rds_info_getsockopt.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Sat Sep 26 11:19:08 PDT 2015
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Sat, 1 Aug 2015 15:33:26 +0300
Subject: rds: fix an integer overflow test in rds_info_getsockopt()
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
[ Upstream commit 468b732b6f76b138c0926eadf38ac88467dcd271 ]
"len" is a signed integer. We check that len is not negative, so it
goes from zero to INT_MAX. PAGE_SIZE is unsigned long so the comparison
is type promoted to unsigned long. ULONG_MAX - 4095 is a higher than
INT_MAX so the condition can never be true.
I don't know if this is harmful but it seems safe to limit "len" to
INT_MAX - 4095.
Fixes: a8c879a7ee98 ('RDS: Info and stats')
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/rds/info.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/rds/info.c
+++ b/net/rds/info.c
@@ -176,7 +176,7 @@ int rds_info_getsockopt(struct socket *s
/* check for all kinds of wrapping and the like */
start = (unsigned long)optval;
- if (len < 0 || len + PAGE_SIZE - 1 < len || start + len < start) {
+ if (len < 0 || len > INT_MAX - PAGE_SIZE + 1 || start + len < start) {
ret = -EINVAL;
goto out;
}
Patches currently in stable-queue which might be from dan.carpenter@xxxxxxxxxx are
queue-3.14/rds-fix-an-integer-overflow-test-in-rds_info_getsockopt.patch
queue-3.14/packet-missing-dev_put-in-packet_do_bind.patch
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