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authorRonnie Sahlberg <lsahlber@redhat.com>2021-08-10 16:33:55 +1000
committerSteve French <stfrench@microsoft.com>2021-08-10 10:45:50 -0500
commit981567bd965329df7e64b13e92a54da816c1e0a4 (patch)
treec33f98b3ad15f17c7570f21711df75e7e310cc98 /fs/cifs
parent7d3fc01796fc895e5fcce45c994c5a8db8120a8d (diff)
downloadlinux-981567bd965329df7e64b13e92a54da816c1e0a4.tar.bz2
cifs: use the correct max-length for dentry_path_raw()
RHBZ: 1972502 PATH_MAX is 4096 but PAGE_SIZE can be >4096 on some architectures such as ppc and would thus write beyond the end of the actual object. Cc: <stable@vger.kernel.org> Reported-by: Xiaoli Feng <xifeng@redhat.com> Suggested-by: Brian foster <bfoster@redhat.com> Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz> Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/dir.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 79402ca0ddfa..5f8a302ffcb2 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -100,7 +100,7 @@ build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
- s = dentry_path_raw(direntry, page, PAGE_SIZE);
+ s = dentry_path_raw(direntry, page, PATH_MAX);
if (IS_ERR(s))
return s;
if (!s[1]) // for root we want "", not "/"