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[NTOSKRNL] Do not try to access OldBackTracking[-1]

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It can be triggered by the existing "F<", "FILE.TXT" case in the tests.

CORE-15902
This commit is contained in:
Bartosz Brachaczek 2019-04-01 02:09:23 +02:00 committed by Pierre Schweitzer
parent 695e00fbbd
commit d256ff6006
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GPG key ID: 7545556C3D585B0B
1 changed files with 2 additions and 2 deletions
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4
ntoskrnl/fsrtl/dbcsname.c
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@ -248,7 +248,7 @@ FsRtlIsDbcsInExpression(IN PANSI_STRING Expression,
if (NamePosition >= Name->Length) if (NamePosition >= Name->Length)
{ {
EndOfName = TRUE; EndOfName = TRUE;
if (OldBackTracking[MatchingChars - 1] == Expression->Length * 2) if (MatchingChars && OldBackTracking[MatchingChars - 1] == Expression->Length * 2)
break; break;
} }
else else
@ -422,7 +422,7 @@ FsRtlIsDbcsInExpression(IN PANSI_STRING Expression,
} }
/* Store result value */ /* Store result value */
Result = (OldBackTracking[MatchingChars - 1] == Expression->Length * 2); Result = MatchingChars && (OldBackTracking[MatchingChars - 1] == Expression->Length * 2);
Exit: Exit: