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| author | Andreas Gruenbacher <agruenba@redhat.com> | 2020-04-20 15:51:47 +0200 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2020-04-20 15:58:59 +0200 |
| commit | 7648f939cb919b9d15c21fff8cd9eba908d595dc (patch) | |
| tree | a1196b12fb041ebbd52c97123087e617b33a6a70 | |
| parent | NFS/pnfs: Fix a credential use-after-free issue in pnfs_roc() (diff) | |
| download | linux-7648f939cb919b9d15c21fff8cd9eba908d595dc.tar.xz linux-7648f939cb919b9d15c21fff8cd9eba908d595dc.zip | |
nfs: Fix potential posix_acl refcnt leak in nfs3_set_acl
nfs3_set_acl keeps track of the acl it allocated locally to determine if an acl
needs to be released at the end. This results in a memory leak when the
function allocates an acl as well as a default acl. Fix by releasing acls
that differ from the acl originally passed into nfs3_set_acl.
Fixes: b7fa0554cf1b ("[PATCH] NFS: Add support for NFSv3 ACLs")
Reported-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
| -rw-r--r-- | fs/nfs/nfs3acl.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/fs/nfs/nfs3acl.c b/fs/nfs/nfs3acl.c index c5c3fc6e6c60..26c94b32d6f4 100644 --- a/fs/nfs/nfs3acl.c +++ b/fs/nfs/nfs3acl.c @@ -253,37 +253,45 @@ int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type) { - struct posix_acl *alloc = NULL, *dfacl = NULL; + struct posix_acl *orig = acl, *dfacl = NULL, *alloc; int status; if (S_ISDIR(inode->i_mode)) { switch(type) { case ACL_TYPE_ACCESS: - alloc = dfacl = get_acl(inode, ACL_TYPE_DEFAULT); + alloc = get_acl(inode, ACL_TYPE_DEFAULT); if (IS_ERR(alloc)) goto fail; + dfacl = alloc; break; case ACL_TYPE_DEFAULT: - dfacl = acl; - alloc = acl = get_acl(inode, ACL_TYPE_ACCESS); + alloc = get_acl(inode, ACL_TYPE_ACCESS); if (IS_ERR(alloc)) goto fail; + dfacl = acl; + acl = alloc; break; } } if (acl == NULL) { - alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); + alloc = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); if (IS_ERR(alloc)) goto fail; + acl = alloc; } status = __nfs3_proc_setacls(inode, acl, dfacl); - posix_acl_release(alloc); +out: + if (acl != orig) + posix_acl_release(acl); + if (dfacl != orig) + posix_acl_release(dfacl); return status; fail: - return PTR_ERR(alloc); + status = PTR_ERR(alloc); + goto out; } const struct xattr_handler *nfs3_xattr_handlers[] = { |