Fix use after free in cgen instruction lookup
* cgen-opc.c (cgen_lookup_insn): Delete buf and base_insn temps. Use insn_bytes_value and insn_int_value directly instead. Don't free allocated memory until function exit.
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@ -1,3 +1,10 @@
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2017-02-11 Stafford Horne <shorne@gmail.com>
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Alan Modra <amodra@gmail.com>
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* cgen-opc.c (cgen_lookup_insn): Delete buf and base_insn temps.
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Use insn_bytes_value and insn_int_value directly instead. Don't
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free allocated memory until function exit.
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2017-02-10 Nicholas Piggin <npiggin@gmail.com>
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* ppc-opc.c (powerpc_opcodes) <scv, rfscv>: New mnemonics.
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@ -452,18 +452,14 @@ cgen_lookup_insn (CGEN_CPU_DESC cd,
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CGEN_FIELDS *fields,
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int alias_p)
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{
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unsigned char *buf;
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CGEN_INSN_INT base_insn;
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CGEN_EXTRACT_INFO ex_info;
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CGEN_EXTRACT_INFO *info;
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if (cd->int_insn_p)
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{
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info = NULL;
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buf = (unsigned char *) xmalloc (cd->max_insn_bitsize / 8);
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cgen_put_insn_value (cd, buf, length, insn_int_value);
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base_insn = insn_int_value;
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free (buf);
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insn_bytes_value = (unsigned char *) xmalloc (cd->max_insn_bitsize / 8);
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cgen_put_insn_value (cd, insn_bytes_value, length, insn_int_value);
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}
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else
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{
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@ -471,8 +467,7 @@ cgen_lookup_insn (CGEN_CPU_DESC cd,
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ex_info.dis_info = NULL;
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ex_info.insn_bytes = insn_bytes_value;
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ex_info.valid = -1;
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buf = insn_bytes_value;
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base_insn = cgen_get_insn_value (cd, buf, length);
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insn_int_value = cgen_get_insn_value (cd, insn_bytes_value, length);
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}
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if (!insn)
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@ -482,7 +477,8 @@ cgen_lookup_insn (CGEN_CPU_DESC cd,
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/* The instructions are stored in hash lists.
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Pick the first one and keep trying until we find the right one. */
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insn_list = cgen_dis_lookup_insn (cd, (char *) buf, base_insn);
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insn_list = cgen_dis_lookup_insn (cd, (char *) insn_bytes_value,
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insn_int_value);
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while (insn_list != NULL)
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{
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insn = insn_list->insn;
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@ -494,18 +490,18 @@ cgen_lookup_insn (CGEN_CPU_DESC cd,
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/* Basic bit mask must be correct. */
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/* ??? May wish to allow target to defer this check until the
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extract handler. */
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if ((base_insn & CGEN_INSN_BASE_MASK (insn))
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if ((insn_int_value & CGEN_INSN_BASE_MASK (insn))
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== CGEN_INSN_BASE_VALUE (insn))
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{
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/* ??? 0 is passed for `pc' */
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int elength = CGEN_EXTRACT_FN (cd, insn)
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(cd, insn, info, base_insn, fields, (bfd_vma) 0);
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(cd, insn, info, insn_int_value, fields, (bfd_vma) 0);
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if (elength > 0)
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{
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/* sanity check */
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if (length != 0 && length != elength)
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abort ();
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return insn;
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break;
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}
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}
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}
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@ -525,15 +521,17 @@ cgen_lookup_insn (CGEN_CPU_DESC cd,
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/* ??? 0 is passed for `pc' */
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length = CGEN_EXTRACT_FN (cd, insn)
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(cd, insn, info, base_insn, fields, (bfd_vma) 0);
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(cd, insn, info, insn_int_value, fields, (bfd_vma) 0);
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/* Sanity check: must succeed.
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Could relax this later if it ever proves useful. */
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if (length == 0)
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abort ();
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return insn;
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}
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return NULL;
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if (cd->int_insn_p)
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free (insn_bytes_value);
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return insn;
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}
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/* Fill in the operand instances used by INSN whose operands are FIELDS.
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