2.6.32-longterm review patch. If anyone has any objections, please let me know.
------------------
commit 468b732b6f76b138c0926eadf38ac88467dcd271 upstream.
"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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Ben Hutchings <[email protected]>
(cherry picked from commit f3a66bdc88c3261f55b942453476e623056b92d9)
Signed-off-by: Willy Tarreau <[email protected]>
---
net/rds/info.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/rds/info.c b/net/rds/info.c
index 814a91a..0a857a0 100644
--- a/net/rds/info.c
+++ b/net/rds/info.c
@@ -174,7 +174,7 @@ int rds_info_getsockopt(struct socket *sock, int optname,
char __user *optval,
/* 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;
}
--
1.7.12.2.21.g234cd45.dirty
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