MIPS: Fix get_frame_info() handling of microMIPS function size

commit b6c7a324df37bf05ef7a2c1580683cf10d082d97 upstream.

get_frame_info() is meant to iterate over up to the first 128
instructions within a function, but for microMIPS kernels it will not
reach that many instructions unless the function is 512 bytes long since
we calculate the maximum number of instructions to check by dividing the
function length by the 4 byte size of a union mips_instruction. In
microMIPS kernels this won't do since instructions are variable length.

Fix this by instead checking whether the pointer to the current
instruction has reached the end of the function, and use max_insns as a
simple constant to check the number of iterations against.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Fixes: 34c2f668d0f6 ("MIPS: microMIPS: Add unaligned access support.")
Cc: Leonid Yegoshin <leonid.yegoshin@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14530/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 71110b9debe3b3150e6e6725c5e77e123e1caab2..e67e17aec9ea70f0e59df07de06c26cb6e7f299d 100644 (file)
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -312,9 +312,9 @@ static inline int is_sp_move_ins(union mips_instruction *ip)
 static int get_frame_info(struct mips_frame_info *info)
 {
        bool is_mmips = IS_ENABLED(CONFIG_CPU_MICROMIPS);
-       union mips_instruction insn, *ip;
-       unsigned max_insns = info->func_size / sizeof(union mips_instruction);
-       unsigned i;
+       union mips_instruction insn, *ip, *ip_end;
+       const unsigned int max_insns = 128;
+       unsigned int i;
 
        info->pc_offset = -1;
        info->frame_size = 0;
@@ -323,11 +323,9 @@ static int get_frame_info(struct mips_frame_info *info)
        if (!ip)
                goto err;
 
-       if (max_insns == 0)
-               max_insns = 128U;       /* unknown function size */
-       max_insns = min(128U, max_insns);
+       ip_end = (void *)ip + info->func_size;
 
-       for (i = 0; i < max_insns; i++, ip++) {
+       for (i = 0; i < max_insns && ip < ip_end; i++, ip++) {
                if (is_mmips && mm_insn_16bit(ip->halfword[0])) {
                        insn.halfword[0] = 0;
                        insn.halfword[1] = ip->halfword[0];