Index: libavcodec/aarch64/mdct_neon.S
--- libavcodec/aarch64/mdct_neon.S.orig
+++ libavcodec/aarch64/mdct_neon.S
@@ -25,6 +25,7 @@
 function ff_imdct_half_neon, export=1
         sub             sp,  sp,  #32
         stp             x19, x20, [sp]
+        AARCH64_SIGN_LINK_REGISTER
         str             x30, [sp, #16]
         mov             x12, #1
         ldr             w14, [x0, #28]          // mdct_bits
@@ -121,6 +122,7 @@ function ff_imdct_half_neon, export=1
 
         ldp             x19, x20, [sp]
         ldr             x30, [sp, #16]
+        AARCH64_VALIDATE_LINK_REGISTER
         add             sp,  sp,  #32
 
         ret
@@ -129,6 +131,7 @@ endfunc
 function ff_imdct_calc_neon, export=1
         sub             sp,  sp,  #32
         stp             x19, x20, [sp]
+        AARCH64_SIGN_LINK_REGISTER
         str             x30, [sp, #16]
         ldr             w3,  [x0, #28]          // mdct_bits
         mov             x19, #1
@@ -160,8 +163,10 @@ function ff_imdct_calc_neon, export=1
         subs            x19, x19,  #16
         b.gt            1b
 
-        ldp             x19, x20, [sp], #16
-        ldr             x30, [sp], #16
+        ldp             x19, x20, [sp]
+        ldr             x30, [sp, #16]
+        AARCH64_VALIDATE_LINK_REGISTER
+        add             sp,  sp,  #32
 
         ret
 endfunc
@@ -170,6 +175,7 @@ endfunc
 function ff_mdct_calc_neon, export=1
         sub             sp,  sp,  #32
         stp             x19, x20, [sp]
+        AARCH64_SIGN_LINK_REGISTER
         str             x30, [sp, #16]
 
         mov             x12, #1
@@ -317,7 +323,10 @@ function ff_mdct_calc_neon, export=1
         st2             {v4.2s,v5.2s},  [x0]
         st2             {v6.2s,v7.2s},  [x8]
 
-        ldp             x19, x20, [sp], #16
-        ldr             x30, [sp], #16
+        ldp             x19, x20, [sp]
+        ldr             x30, [sp, #16]
+        AARCH64_VALIDATE_LINK_REGISTER
+        add             sp,  sp,  #32
+
         ret
 endfunc