korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-11 04:18:39 +08:00
Code Issues Packages Projects Releases Wiki Activity

NFSv4.2: Fix a memory stomp in decode_attr_security_label

Browse Source 
We must not change the value of label->len if it is zero, since that
indicates we stored a label.

Fixes: b4487b9354 ("nfs: Fix getxattr kernel panic and memory overflow")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2022-10-18 18:21:14 -04:00
parent c8a62f4402
commit 43c1031f71
1 changed files with 4 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
fs/nfs/nfs4xdr.c
View File

@ -4236,12 +4236,10 @@ static int decode_attr_security_label(struct xdr_stream *xdr, uint32_t *bitmap,
return -EIO;
bitmap[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
if (len < NFS4_MAXLABELLEN) {
if (label) {
if (label->len) {
if (label->len < len)
return -ERANGE;
memcpy(label->label, p, len);
}
if (label && label->len) {
if (label->len < len)
return -ERANGE;
memcpy(label->label, p, len);
label->len = len;
label->pi = pi;
label->lfs = lfs;