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| author | Vasily Averin <vvs@virtuozzo.com> | 2016-01-14 13:41:14 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-25 11:58:54 -0800 |
| commit | 827f86f6a3b2f37d4757a4f49b02bfb2c1580602 (patch) | |
| tree | 802ddd2cce02b87c1e64f544f88fe5303622c707 | |
| parent | 6c1a9c4caad3cdaea588413830ad7692afdd89f9 (diff) | |
| download | lwn-827f86f6a3b2f37d4757a4f49b02bfb2c1580602.tar.gz lwn-827f86f6a3b2f37d4757a4f49b02bfb2c1580602.zip | |
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>
| -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 b334a89d6a66..1320d1ecc630 100644 --- a/fs/cifs/readdir.c +++ b/fs/cifs/readdir.c @@ -849,6 +849,7 @@ 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) { |