leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

netfilter: nfnetlink_osf: fix possible bogus match in nf_osf_find()

Browse Source 
nf_osf_find() incorrectly returns true on mismatch, this leads to
copying uninitialized memory area in nft_osf which can be used to leak
stale kernel stack data to userspace.

Fixes: 22c7652cda ("netfilter: nft_osf: Add version option support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
This commit is contained in:
Pablo Neira Ayuso 2022-09-07 10:26:18 +02:00 committed by Florian Westphal
parent e8d5dfd1d8
commit 559c36c5a8
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
net/netfilter/nfnetlink_osf.c
View File

@ -269,6 +269,7 @@ bool nf_osf_find(const struct sk_buff *skb,
struct nf_osf_hdr_ctx ctx;
const struct tcphdr *tcp;
struct tcphdr _tcph;
bool found = false;
memset(&ctx, 0, sizeof(ctx));
@ -283,10 +284,11 @@ bool nf_osf_find(const struct sk_buff *skb,
data->genre = f->genre;
data->version = f->version;
found = true;
break;
}
return true;
return found;
}
EXPORT_SYMBOL_GPL(nf_osf_find);