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 <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: David Howells <[email protected]>
Cc: [email protected]
Cc: Jan Kara <[email protected]>
---
fs/afs/xattr.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/fs/afs/xattr.c b/fs/afs/xattr.c
index 5552d034090a..7af41fd5f3ee 100644
--- a/fs/afs/xattr.c
+++ b/fs/afs/xattr.c
@@ -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;
--
2.24.0.rc1.363.gb1bccd3e3d-goog