Messages in this thread Patch in this message | | | From | Kamal Mostafa <> | Subject | [PATCH 3.19.y-ckt 112/210] cifs_dbg() outputs an uninitialized buffer in cifs_readdir() | Date | Thu, 28 Jan 2016 17:17:30 -0800 |
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3.19.8-ckt14 -stable review patch. If anyone has any objections, please let me know.
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From: Vasily Averin <vvs@virtuozzo.com>
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: Kamal Mostafa <kamal@canonical.com> --- fs/cifs/readdir.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c index c295338..c4be623 100644 --- a/fs/cifs/readdir.c +++ b/fs/cifs/readdir.c @@ -845,6 +845,7 @@ 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) { -- 1.9.1
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