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[NTVDM]

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Don't crash when DosFreeMemory is called with BlockData == 0.


svn path=/trunk/; revision=67475
This commit is contained in:
Aleksandar Andrejevic 2015-04-29 00:47:06 +00:00
parent 38af0226a1
commit 86c7c4fb83
1 changed files with 1 additions and 0 deletions
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reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/memory.c
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@ -319,6 +319,7 @@ BOOLEAN DosFreeMemory(WORD BlockData)
PDOS_MCB Mcb = SEGMENT_TO_MCB(BlockData - 1); PDOS_MCB Mcb = SEGMENT_TO_MCB(BlockData - 1);
DPRINT("DosFreeMemory: BlockData 0x%04X\n", BlockData); DPRINT("DosFreeMemory: BlockData 0x%04X\n", BlockData);
if (BlockData == 0) return FALSE;
/* Make sure the MCB is valid */ /* Make sure the MCB is valid */
if (Mcb->BlockType != 'M' && Mcb->BlockType != 'Z') if (Mcb->BlockType != 'M' && Mcb->BlockType != 'Z')