1 files changed, 4 insertions, 1 deletions

diff --git a/arch/i386/kernel/alternative.c b/arch/i386/kernel/alternative.c
index dae3ded9041c..c5d037c60950 100644
--- a/arch/i386/kernel/alternative.c
+++ b/arch/i386/kernel/alternative.c
@@ -336,11 +336,14 @@ void apply_paravirt(struct paravirt_patch_site *start,
                 used = paravirt_ops.patch(p->instrtype, p->clobbers, p->instr,
                                           p->len);
 
+                BUG_ON(used > p->len);
+
                 /* Pad the rest with nops */
                 nop_out(p->instr + used, p->len - used);
         }
 
-        /* Sync to be conservative, in case we patched following instructions */
+        /* Sync to be conservative, in case we patched following
+         * instructions */
         sync_core();
 }
 extern struct paravirt_patch_site __start_parainstructions[],