The branch stable/13 has been updated by rmacklem:
URL:
https://cgit.FreeBSD.org/src/commit/?id=a41216dbe060032bb439d55220bd4a8e135ec80f
commit a41216dbe060032bb439d55220bd4a8e135ec80f
Author: Rick Macklem <rmack...@freebsd.org>
AuthorDate: 2021-12-09 22:15:48 +0000
Commit: Rick Macklem <rmack...@freebsd.org>
CommitDate: 2021-12-23 01:36:18 +0000
nfscl: Sanity check the callback tag length
The sanity check for tag length in a callback request
was broken in two ways:
It checked for a negative value, but not a large positive
value.
It did not set taglen to -1, to indicate to the code that
it should not be used.
This patch fixes both of these issues.
PR: 260266
(cherry picked from commit d9931c25617d6625e280fda19bd9c2878e49c091)
---
sys/fs/nfsclient/nfs_clstate.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/sys/fs/nfsclient/nfs_clstate.c b/sys/fs/nfsclient/nfs_clstate.c
index 08eada1e1c3e..f34b9e3e05b6 100644
--- a/sys/fs/nfsclient/nfs_clstate.c
+++ b/sys/fs/nfsclient/nfs_clstate.c
@@ -3533,8 +3533,9 @@ nfscl_docb(struct nfsrv_descript *nd, NFSPROC_T *p)
nfsrvd_rephead(nd);
NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
taglen = fxdr_unsigned(int, *tl);
- if (taglen < 0) {
+ if (taglen < 0 || taglen > NFSV4_OPAQUELIMIT) {
error = EBADRPC;
+ taglen = -1;
goto nfsmout;
}
if (taglen <= NFSV4_SMALLSTR)
