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authorRichard Weinberger <richard@nod.at>2017-06-16 16:21:44 +0200
committerRichard Weinberger <richard@nod.at>2017-07-14 22:50:52 +0200
commit4acadda74ff8b949c448c0282765ae747e088c87 (patch)
treef352b5b37c1f1da4f73e2e8c1bccea9b05c767dd /fs
parent480a1a6a3ef6fb6be4cd2f37b34314fbf64867dd (diff)
downloadlinux-4acadda74ff8b949c448c0282765ae747e088c87.tar.bz2
ubifs: Don't leak kernel memory to the MTD
When UBIFS prepares data structures which will be written to the MTD it ensues that their lengths are multiple of 8. Since it uses kmalloc() the padded bytes are left uninitialized and we leak a few bytes of kernel memory to the MTD. To make sure that all bytes are initialized, let's switch to kzalloc(). Kzalloc() is fine in this case because the buffers are not huge and in the IO path the performance bottleneck is anyway the MTD. Cc: stable@vger.kernel.org Fixes: 1e51764a3c2a ("UBIFS: add new flash file system") Signed-off-by: Richard Weinberger <richard@nod.at> Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'fs')
-rw-r--r--fs/ubifs/journal.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c
index 419c79ff377e..9f356432f35f 100644
--- a/fs/ubifs/journal.c
+++ b/fs/ubifs/journal.c
@@ -572,7 +572,7 @@ int ubifs_jnl_update(struct ubifs_info *c, const struct inode *dir,
/* Make sure to also account for extended attributes */
len += host_ui->data_len;
- dent = kmalloc(len, GFP_NOFS);
+ dent = kzalloc(len, GFP_NOFS);
if (!dent)
return -ENOMEM;
@@ -968,7 +968,7 @@ int ubifs_jnl_xrename(struct ubifs_info *c, const struct inode *fst_dir,
if (twoparents)
len += plen;
- dent1 = kmalloc(len, GFP_NOFS);
+ dent1 = kzalloc(len, GFP_NOFS);
if (!dent1)
return -ENOMEM;
@@ -1116,7 +1116,7 @@ int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir,
len = aligned_dlen1 + aligned_dlen2 + ALIGN(ilen, 8) + ALIGN(plen, 8);
if (move)
len += plen;
- dent = kmalloc(len, GFP_NOFS);
+ dent = kzalloc(len, GFP_NOFS);
if (!dent)
return -ENOMEM;
@@ -1498,7 +1498,7 @@ int ubifs_jnl_delete_xattr(struct ubifs_info *c, const struct inode *host,
hlen = host_ui->data_len + UBIFS_INO_NODE_SZ;
len = aligned_xlen + UBIFS_INO_NODE_SZ + ALIGN(hlen, 8);
- xent = kmalloc(len, GFP_NOFS);
+ xent = kzalloc(len, GFP_NOFS);
if (!xent)
return -ENOMEM;
@@ -1605,7 +1605,7 @@ int ubifs_jnl_change_xattr(struct ubifs_info *c, const struct inode *inode,
aligned_len1 = ALIGN(len1, 8);
aligned_len = aligned_len1 + ALIGN(len2, 8);
- ino = kmalloc(aligned_len, GFP_NOFS);
+ ino = kzalloc(aligned_len, GFP_NOFS);
if (!ino)
return -ENOMEM;