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afs: xattr: use scnprintf 

sprintf and snprintf are fragile in future maintenance, switch to
using scnprintf to ensure no accidental Use After Free conditions
are introduced.

Signed-off-by: Mark Salyzyn <salyzyn@android.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Cc: David Howells <dhowells@redhat.com>
Cc: linux-afs@lists.infradead.org
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
Mark Salyzyn 2019-11-21 09:12:17 +00:00 committed by David Howells
parent d4438a2529
commit 2e2fae99d1
1 changed files with 9 additions and 7 deletions
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16
fs/afs/xattr.c
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@ -228,11 +228,11 @@ static int afs_xattr_get_yfs(const struct xattr_handler *handler,
break;
case 1:
data = buf;
dsize = snprintf(buf, sizeof(buf), "%u", yacl->inherit_flag);
dsize = scnprintf(buf, sizeof(buf), "%u", yacl->inherit_flag);
break;
case 2:
data = buf;
dsize = snprintf(buf, sizeof(buf), "%u", yacl->num_cleaned);
dsize = scnprintf(buf, sizeof(buf), "%u", yacl->num_cleaned);
break;
case 3:
data = yacl->vol_acl->data;
@ -370,13 +370,15 @@ static int afs_xattr_get_fid(const struct xattr_handler *handler,
/* The volume ID is 64-bit, the vnode ID is 96-bit and the
* uniquifier is 32-bit.
*/
len = sprintf(text, "%llx:", vnode->fid.vid);
len = scnprintf(text, sizeof(text), "%llx:", vnode->fid.vid);
if (vnode->fid.vnode_hi)
len += sprintf(text + len, "%x%016llx",
vnode->fid.vnode_hi, vnode->fid.vnode);
len += scnprintf(text + len, sizeof(text) - len, "%x%016llx",
vnode->fid.vnode_hi, vnode->fid.vnode);
else
len += sprintf(text + len, "%llx", vnode->fid.vnode);
len += sprintf(text + len, ":%x", vnode->fid.unique);
len += scnprintf(text + len, sizeof(text) - len, "%llx",
vnode->fid.vnode);
len += scnprintf(text + len, sizeof(text) - len, ":%x",
vnode->fid.unique);
if (size == 0)
return len;