tcmd/yacc: do not create an out of bounds pointer - plan9port - [fork] Plan 9 from user space
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       ---
 (DIR) commit 4a3f20bceee7cef125f9a88bab32439f9fe4f773
 (DIR) parent 7ba9f9467d95fa8d05bb04d36fd4c602e497f529
 (HTM) Author: Neven Sajko <nsajko@gmail.com>
       Date:   Thu, 22 Aug 2019 11:28:53 +0000
       
       cmd/yacc: do not create an out of bounds pointer
       
       An out of bounds pointer/array index being created is an error in
       standard C.
       
       Updates #313
       
       Change-Id: I7108fcde1a8e03017e9ab852adb737940489c827
       
       Diffstat:
         M src/cmd/yacc.c                      |       3 ++-
       
       1 file changed, 2 insertions(+), 1 deletion(-)
       ---
 (DIR) diff --git a/src/cmd/yacc.c b/src/cmd/yacc.c
       t@@ -2819,8 +2819,9 @@ stin(int i)
                for(n = -maxoff; n < ACTSIZE; n++) {
                        flag = 0;
                        for(r = q1; r < q2; r += 2) {
       -                        if((s = *r + n + amem) < amem)
       +                        if(*r + n < 0)
                                        goto nextn;
       +                        s = *r + n + amem;
                                if(*s == 0)
                                        flag++;
                                else