[RFC PATCH 5/8] KEYS: Prevent overflow of quota in key_alloc()

[Jarkko Sakkinen]

Check that the calculated quota length does not go over INT_MAX.

Cc: stable at vger.kernel.org
Assisted-by: LLM
Fixes: 7e047ef5fe2d ("[PATCH] keys: sort out key quota system")
Signed-off-by: Jarkko Sakkinen <jarkko at kernel.org>
---
 security/keys/key.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/keys/key.c b/security/keys/key.c
index 30f8a8dea206..18043251365f 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -245,7 +245,7 @@ struct key *key_alloc(struct key_type *type, const char *desc,
 	}
 
 	desclen = strlen(desc);
-	if (desclen > U16_MAX)
+	if (desclen > U16_MAX || type->def_datalen > INT_MAX - desclen - 1)
 		goto error;
 	quotalen = desclen + 1 + type->def_datalen;
 
-- 
2.47.3