This is a note to let you know that I've just added the patch titled
fs: nfsd: Fix signedness bug in compare_blob
to the 3.10-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:
fs-nfsd-fix-signedness-bug-in-compare_blob.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From ef17af2a817db97d42dd2ec0a425231748e23dbc Mon Sep 17 00:00:00 2001
From: Rasmus Villemoes <[email protected]>
Date: Fri, 5 Dec 2014 16:40:07 +0100
Subject: fs: nfsd: Fix signedness bug in compare_blob
From: Rasmus Villemoes <[email protected]>
commit ef17af2a817db97d42dd2ec0a425231748e23dbc upstream.
Bugs similar to the one in acbbe6fbb240 (kcmp: fix standard comparison
bug) are in rich supply.
In this variant, the problem is that struct xdr_netobj::len has type
unsigned int, so the expression o1->len - o2->len _also_ has type
unsigned int; it has completely well-defined semantics, and the result
is some non-negative integer, which is always representable in a long
long. But this means that if the conditional triggers, we are
guaranteed to return a positive value from compare_blob.
In this case it could be fixed by
- res = o1->len - o2->len;
+ res = (long long)o1->len - (long long)o2->len;
but I'd rather eliminate the usually broken 'return a - b;' idiom.
Reviewed-by: Jeff Layton <[email protected]>
Signed-off-by: Rasmus Villemoes <[email protected]>
Signed-off-by: J. Bruce Fields <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/nfsd/nfs4state.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1200,15 +1200,14 @@ static int copy_cred(struct svc_cred *ta
return 0;
}
-static long long
+static int
compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
{
- long long res;
-
- res = o1->len - o2->len;
- if (res)
- return res;
- return (long long)memcmp(o1->data, o2->data, o1->len);
+ if (o1->len < o2->len)
+ return -1;
+ if (o1->len > o2->len)
+ return 1;
+ return memcmp(o1->data, o2->data, o1->len);
}
static int same_name(const char *n1, const char *n2)
@@ -1365,7 +1364,7 @@ add_clp_to_name_tree(struct nfs4_client
static struct nfs4_client *
find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
{
- long long cmp;
+ int cmp;
struct rb_node *node = root->rb_node;
struct nfs4_client *clp;
Patches currently in stable-queue which might be from [email protected]
are
queue-3.10/fs-nfsd-fix-signedness-bug-in-compare_blob.patch
queue-3.10/alsa-hda-fix-wrong-gpio_dir-gpio_mask-hint-setups-for-idt-stac-codecs.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
