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authorSanidhya Kashyap <sanidhya.gatech@gmail.com>2015-03-21 12:54:58 -0400
committerIlya Dryomov <idryomov@gmail.com>2015-04-20 18:55:34 +0300
commita149bb9a281c5c2904cf6fcdf9ed386340032ce3 (patch)
tree644078c1ab0c063382210f3d0b43a239070b1364 /fs/ceph
parentc1d00b2d9c4fc821e33c5cdfbdbc32677cb0e2e0 (diff)
ceph: kstrdup() memory handling
Currently, there is no check for the kstrdup() for r_path2, r_path1 and snapdir_name as various locations as there is a possibility of failure during memory pressure. Therefore, returning ENOMEM where the checks have been missed. Signed-off-by: Sanidhya Kashyap <sanidhya.gatech@gmail.com> Signed-off-by: Yan, Zheng <zyan@redhat.com>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/dir.c24
-rw-r--r--fs/ceph/super.c10
-rw-r--r--fs/ceph/xattr.c23
3 files changed, 44 insertions, 13 deletions
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index d486f2a5a88d..98c71e895e81 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -337,16 +337,23 @@ more:
ceph_mdsc_put_request(req);
return err;
}
- req->r_inode = inode;
- ihold(inode);
- req->r_dentry = dget(file->f_path.dentry);
/* hints to request -> mds selection code */
req->r_direct_mode = USE_AUTH_MDS;
req->r_direct_hash = ceph_frag_value(frag);
req->r_direct_is_hash = true;
- req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
+ if (fi->last_name) {
+ req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
+ if (!req->r_path2) {
+ ceph_mdsc_put_request(req);
+ return -ENOMEM;
+ }
+ }
req->r_readdir_offset = fi->next_offset;
req->r_args.readdir.frag = cpu_to_le32(frag);
+
+ req->r_inode = inode;
+ ihold(inode);
+ req->r_dentry = dget(file->f_path.dentry);
err = ceph_mdsc_do_request(mdsc, NULL, req);
if (err < 0) {
ceph_mdsc_put_request(req);
@@ -757,10 +764,15 @@ static int ceph_symlink(struct inode *dir, struct dentry *dentry,
err = PTR_ERR(req);
goto out;
}
- req->r_dentry = dget(dentry);
- req->r_num_caps = 2;
req->r_path2 = kstrdup(dest, GFP_NOFS);
+ if (!req->r_path2) {
+ err = -ENOMEM;
+ ceph_mdsc_put_request(req);
+ goto out;
+ }
req->r_locked_dir = dir;
+ req->r_dentry = dget(dentry);
+ req->r_num_caps = 2;
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
err = ceph_mdsc_do_request(mdsc, dir, req);
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index a63997b8bcff..9f035ccb6191 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -345,6 +345,11 @@ static int parse_mount_options(struct ceph_mount_options **pfsopt,
fsopt->rsize = CEPH_RSIZE_DEFAULT;
fsopt->rasize = CEPH_RASIZE_DEFAULT;
fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL);
+ if (!fsopt->snapdir_name) {
+ err = -ENOMEM;
+ goto out;
+ }
+
fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT;
fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT;
fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT;
@@ -730,6 +735,11 @@ static struct dentry *open_root_dentry(struct ceph_fs_client *fsc,
if (IS_ERR(req))
return ERR_CAST(req);
req->r_path1 = kstrdup(path, GFP_NOFS);
+ if (!req->r_path1) {
+ root = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
req->r_ino1.ino = CEPH_INO_ROOT;
req->r_ino1.snap = CEPH_NOSNAP;
req->r_started = started;
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 5a492caf34cb..5c4c9c256931 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -877,16 +877,23 @@ static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
err = PTR_ERR(req);
goto out;
}
- req->r_inode = inode;
- ihold(inode);
- req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
- req->r_num_caps = 1;
+
req->r_args.setxattr.flags = cpu_to_le32(flags);
req->r_path2 = kstrdup(name, GFP_NOFS);
+ if (!req->r_path2) {
+ ceph_mdsc_put_request(req);
+ err = -ENOMEM;
+ goto out;
+ }
req->r_pagelist = pagelist;
pagelist = NULL;
+ req->r_inode = inode;
+ ihold(inode);
+ req->r_num_caps = 1;
+ req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
+
dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
err = ceph_mdsc_do_request(mdsc, NULL, req);
ceph_mdsc_put_request(req);
@@ -1019,12 +1026,14 @@ static int ceph_send_removexattr(struct dentry *dentry, const char *name)
USE_AUTH_MDS);
if (IS_ERR(req))
return PTR_ERR(req);
+ req->r_path2 = kstrdup(name, GFP_NOFS);
+ if (!req->r_path2)
+ return -ENOMEM;
+
req->r_inode = inode;
ihold(inode);
- req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
req->r_num_caps = 1;
- req->r_path2 = kstrdup(name, GFP_NOFS);
-
+ req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
err = ceph_mdsc_do_request(mdsc, NULL, req);
ceph_mdsc_put_request(req);
return err;