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| author | Vasily Averin <vvs@virtuozzo.com> | 2016-01-14 13:41:14 +0300 |
|---|---|---|
| committer | Steve French <sfrench@localhost.localdomain> | 2016-01-14 14:45:49 -0600 |
| commit | 01b9b0b28626db4a47d7f48744d70abca9914ef1 (patch) | |
| tree | fd31f5cc68e6b880be1315249de944ad8ffcd023 /fs/cifs | |
| parent | 820962dc700598ffe8cd21b967e30e7520c34748 (diff) | |
| download | linux-01b9b0b28626db4a47d7f48744d70abca9914ef1.tar.gz linux-01b9b0b28626db4a47d7f48744d70abca9914ef1.tar.bz2 linux-01b9b0b28626db4a47d7f48744d70abca9914ef1.zip | |
cifs_dbg() outputs an uninitialized buffer in cifs_readdir()
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>
CC: Stable <stable@vger.kernel.org>
Diffstat (limited to 'fs/cifs')
| -rw-r--r-- | fs/cifs/readdir.c | 1 |
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) { |