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https://gitlab.com/federicomenaquintero/bzip2/commit/74de1e2e6ffc9d
diff --git a/decompress.c b/decompress.c
--- a/decompress.c
+++ b/decompress.c
@@ -287,7 +287,7 @@
GET_BITS(BZ_X_SELECTOR_1, nGroups, 3);
if (nGroups < 2 || nGroups > 6) RETURN(BZ_DATA_ERROR);
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++) {
j = 0;
while (True) {
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