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Make sure nSelectors is not out of range

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nSelectors is used in a loop from 0 to nSelectors to access selectorMtf
which is
	UChar    selectorMtf[BZ_MAX_SELECTORS];
so if nSelectors is bigger than BZ_MAX_SELECTORS it'll do an invalid memory
access

Fixes out of bounds access discovered while fuzzying karchive
This commit is contained in:
Albert Astals Cid
2019-05-28 19:35:18 +02:00
committed by Federico Mena Quintero
parent 5381b4f2f8
commit 74de1e2e6f
1 changed files with 1 additions and 1 deletions
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2
decompress.c
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@@ -287,7 +287,7 @@ Int32 BZ2_decompress ( DState* s )
GET_BITS(BZ_X_SELECTOR_1, nGroups, 3); GET_BITS(BZ_X_SELECTOR_1, nGroups, 3);
if (nGroups < 2 || nGroups > 6) RETURN(BZ_DATA_ERROR); if (nGroups < 2 || nGroups > 6) RETURN(BZ_DATA_ERROR);
GET_BITS(BZ_X_SELECTOR_2, nSelectors, 15); GET_BITS(BZ_X_SELECTOR_2, nSelectors, 15);
if (nSelectors < 1) RETURN(BZ_DATA_ERROR); if (nSelectors < 1 || nSelectors > BZ_MAX_SELECTORS) RETURN(BZ_DATA_ERROR);
for (i = 0; i < nSelectors; i++) { for (i = 0; i < nSelectors; i++) {
j = 0; j = 0;
while (True) { while (True) {