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authorVasily Averin <vvs@virtuozzo.com>2016-01-14 13:41:14 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-02-25 12:01:17 -0800
commit7e30995b26ccc952e30bbc2563fc5728c50c9e12 (patch)
treeeb565764a44574481c06deffc8ac3979b7d7f5bf /fs
parent5d80673404e691093d66fc5b02c8bc2ac1692d77 (diff)
cifs_dbg() outputs an uninitialized buffer in cifs_readdir()
commit 01b9b0b28626db4a47d7f48744d70abca9914ef1 upstream. In some cases tmp_bug can be not filled in cifs_filldir and stay uninitialized, therefore its printk with "%s" modifier can leak content of kernelspace memory. If old content of this buffer does not contain '\0' access bejond end of allocated object can crash the host. Signed-off-by: Vasily Averin <vvs@virtuozzo.com> Signed-off-by: Steve French <sfrench@localhost.localdomain> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/readdir.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 0557c45e9c33..b30a4a6d98a0 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -847,6 +847,7 @@ int cifs_readdir(struct file *file, struct dir_context *ctx)
* if buggy server returns . and .. late do we want to
* check for that here?
*/
+ *tmp_buf = 0;
rc = cifs_filldir(current_entry, file, ctx,
tmp_buf, max_len);
if (rc) {