swapon: check validity of swap_flags

[platform/adaptation/renesas_rcar/renesas_kernel.git] / mm / swapfile.c

diff --git a/mm/swapfile.c b/mm/swapfile.c
index dae42f3..fafc26d 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -2022,6 +2022,9 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
        struct page *page = NULL;
        struct inode *inode = NULL;
 
+       if (swap_flags & ~SWAP_FLAGS_VALID)
+               return -EINVAL;
+
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;