Merge tag 'powerpc-5.15-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...

[sfrench/cifs-2.6.git] / arch / powerpc / net / bpf_jit.h

diff --git a/arch/powerpc/net/bpf_jit.h b/arch/powerpc/net/bpf_jit.h
index 99fad093f43ec105775d1983edfa85a37e0d1f5c..7e9b978b768ed967c0ed1ae1f32e6b56cb6e76d6 100644 (file)
--- a/arch/powerpc/net/bpf_jit.h
+++ b/arch/powerpc/net/bpf_jit.h
@@ -24,16 +24,30 @@
 #define EMIT(instr)            PLANT_INSTR(image, ctx->idx, instr)
 
 /* Long jump; (unconditional 'branch') */
-#define PPC_JMP(dest)          EMIT(PPC_INST_BRANCH |                        \
-                                    (((dest) - (ctx->idx * 4)) & 0x03fffffc))
+#define PPC_JMP(dest)                                                        \
+       do {                                                                  \
+               long offset = (long)(dest) - (ctx->idx * 4);                  \
+               if (!is_offset_in_branch_range(offset)) {                     \
+                       pr_err_ratelimited("Branch offset 0x%lx (@%u) out of range\n", offset, ctx->idx);                       \
+                       return -ERANGE;                                       \
+               }                                                             \
+               EMIT(PPC_INST_BRANCH | (offset & 0x03fffffc));                \
+       } while (0)
+
 /* blr; (unconditional 'branch' with link) to absolute address */
 #define PPC_BL_ABS(dest)       EMIT(PPC_INST_BL |                            \
                                     (((dest) - (unsigned long)(image + ctx->idx)) & 0x03fffffc))
 /* "cond" here covers BO:BI fields. */
-#define PPC_BCC_SHORT(cond, dest)      EMIT(PPC_INST_BRANCH_COND |           \
-                                            (((cond) & 0x3ff) << 16) |       \
-                                            (((dest) - (ctx->idx * 4)) &     \
-                                             0xfffc))
+#define PPC_BCC_SHORT(cond, dest)                                            \
+       do {                                                                  \
+               long offset = (long)(dest) - (ctx->idx * 4);                  \
+               if (!is_offset_in_cond_branch_range(offset)) {                \
+                       pr_err_ratelimited("Conditional branch offset 0x%lx (@%u) out of range\n", offset, ctx->idx);           \
+                       return -ERANGE;                                       \
+               }                                                             \
+               EMIT(PPC_INST_BRANCH_COND | (((cond) & 0x3ff) << 16) | (offset & 0xfffc));                                      \
+       } while (0)
+
 /* Sign-extended 32-bit immediate load */
 #define PPC_LI32(d, i)         do {                                          \
                if ((int)(uintptr_t)(i) >= -32768 &&                          \
@@ -78,11 +92,6 @@
 #define PPC_FUNC_ADDR(d,i) do { PPC_LI32(d, i); } while(0)
 #endif
 
-static inline bool is_nearbranch(int offset)
-{
-       return (offset < 32768) && (offset >= -32768);
-}
-
 /*
  * The fly in the ointment of code size changing from pass to pass is
  * avoided by padding the short branch case with a NOP.         If code size differs
@@ -91,7 +100,7 @@ static inline bool is_nearbranch(int offset)
  * state.
  */
 #define PPC_BCC(cond, dest)    do {                                          \
-               if (is_nearbranch((dest) - (ctx->idx * 4))) {                 \
+               if (is_offset_in_cond_branch_range((long)(dest) - (ctx->idx * 4))) {    \
                        PPC_BCC_SHORT(cond, dest);                            \
                        EMIT(PPC_RAW_NOP());                                  \
                } else {                                                      \