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avoid dereferencing nil type on undefined name.

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R=ken
DELTA=12  (12 added, 0 deleted, 0 changed)
OCL=15506
CL=15528
This commit is contained in:
Russ Cox 2008-09-19 09:39:09 -07:00
parent 6e08991eba
commit 5eb9e0621b
1 changed files with 12 additions and 0 deletions
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12
src/cmd/gc/walk.c
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@ -915,6 +915,8 @@ loop:
case ONOT:
case OANDAND:
case OOROR:
if(n->left->type == T)
goto ret;
et = n->left->type->etype;
if(et != TBOOL)
goto badt;
@ -923,6 +925,8 @@ loop:
case OEQ:
case ONE:
if(n->left->type == T)
goto ret;
et = n->left->type->etype;
if(!okforeq[et])
goto badt;
@ -933,6 +937,8 @@ loop:
case OLE:
case OGE:
case OGT:
if(n->left->type == T)
goto ret;
et = n->left->type->etype;
if(!okforadd[et])
if(!isptrto(n->left->type, TSTRING))
@ -945,12 +951,16 @@ loop:
case OMUL:
case ODIV:
case OPLUS:
if(n->left->type == T)
goto ret;
et = n->left->type->etype;
if(!okforadd[et])
goto badt;
break;
case OMINUS:
if(n->left->type == T)
goto ret;
et = n->left->type->etype;
if(!okforadd[et])
goto badt;
@ -974,6 +984,8 @@ loop:
case OXOR:
case OMOD:
case OCOM:
if(n->left->type == T)
goto ret;
et = n->left->type->etype;
if(!okforand[et])
goto badt;