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[CMD] IF: Add extra validity checks in ExecuteIf().

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Hermès Bélusca-Maïto 2020-09-03 16:03:18 +02:00
parent 038daa6367
commit c81bf4f823
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GPG key ID: 3B2539C65E7B93D0
2 changed files with 20 additions and 9 deletions
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2
base/shell/cmd/cmd.c
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@ -938,7 +938,7 @@ GetEnvVarOrSpecial(LPCTSTR varName)
/* %CMDEXTVERSION% */
else if (_tcsicmp(varName, _T("CMDEXTVERSION")) == 0)
{
/* Set version number to CMDEXTVERSION */
/* Set Command Extensions version number to CMDEXTVERSION */
_itot(CMDEXTVERSION, ret, 10);
return ret;
}

27
base/shell/cmd/if.c
View file

@ -78,20 +78,19 @@ INT ExecuteIf(PARSED_COMMAND *Cmd)
Right = DoDelayedExpansion(Cmd->If.RightArg);
if (!Right)
{
cmd_free(Left);
if (Left) cmd_free(Left);
return 1;
}
if (bEnableExtensions && (Cmd->If.Operator == IF_CMDEXTVERSION))
{
/* IF CMDEXTVERSION n: check if Command Extensions version
* is greater or equal to n */
/* IF CMDEXTVERSION n: check if Command Extensions
* version is greater or equal to n. */
DWORD n = _tcstoul(Right, &param, 10);
if (*param != _T('\0'))
{
error_syntax(Right);
cmd_free(Right);
return 1;
goto fail;
}
result = (CMDEXTVERSION >= n);
}
@ -107,8 +106,7 @@ INT ExecuteIf(PARSED_COMMAND *Cmd)
if (*param != _T('\0'))
{
error_syntax(Right);
cmd_free(Right);
return 1;
goto fail;
}
result = (nErrorLevel >= n);
}
@ -178,11 +176,19 @@ INT ExecuteIf(PARSED_COMMAND *Cmd)
case IF_LEQ: result = (result <= 0); break;
case IF_GTR: result = (result > 0); break;
case IF_GEQ: result = (result >= 0); break;
default: goto unknownOp;
}
}
else
{
unknownOp:
ERR("Unknown IF operator 0x%x\n", Cmd->If.Operator);
ASSERT(FALSE);
goto fail;
}
}
cmd_free(Left);
if (Left) cmd_free(Left);
cmd_free(Right);
if (result ^ ((Cmd->If.Flags & IFFLAG_NEGATE) != 0))
@ -195,6 +201,11 @@ INT ExecuteIf(PARSED_COMMAND *Cmd)
/* Full condition was false, do the "else" command if there is one */
return ExecuteCommand(Cmd->Subcommands->Next);
}
fail:
if (Left) cmd_free(Left);
cmd_free(Right);
return 1;
}
/* EOF */