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[backport v1.6.x] fixes the discVal register is used after free in vmgen (#22688) (#23553)

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follow up https://github.com/nim-lang/Nim/pull/11955

(cherry picked from commit b1a8d6976f)

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>
This commit is contained in:
Nikolay Nikolov
2024-05-01 23:56:16 +03:00
committed by GitHub
parent b7b3f87719
commit 6a63df181f
1 changed files with 1 additions and 1 deletions
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2
compiler/vmgen.nim
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@@ -1825,7 +1825,6 @@ proc genCheckedObjAccessAux(c: PCtx; n: PNode; dest: var TDest; flags: TGenFlags
let setLit = c.genx(checkExpr[1])
var rs = c.getTemp(getSysType(c.graph, n.info, tyBool))
c.gABC(n, opcContainsSet, rs, setLit, discVal)
c.freeTemp(discVal)
c.freeTemp(setLit)
# If the check fails let the user know
let lab1 = c.xjmp(n, if negCheck: opcFJmp else: opcTJmp, rs)
@@ -1838,6 +1837,7 @@ proc genCheckedObjAccessAux(c: PCtx; n: PNode; dest: var TDest; flags: TGenFlags
strLit.typ = strType
c.genLit(strLit, msgReg)
c.gABC(n, opcInvalidField, msgReg, discVal)
c.freeTemp(discVal)
c.freeTemp(msgReg)
c.patch(lab1)