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Avoid NULL pointer dereference (#1154)

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If the allocated region is 0 bytes then it's unsafe to dereference it.

Fixes #1147.
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blawrence-ont
2024-01-24 12:32:05 -05:00
committed by GitHub
parent fc2e1607d7
commit f3e59fc2a0
1 changed files with 1 additions and 0 deletions
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index.c
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@@ -192,6 +192,7 @@ int32_t mm_idx_cal_max_occ(const mm_idx_t *mi, float f)
if (f <= 0.) return INT32_MAX; if (f <= 0.) return INT32_MAX;
for (i = 0; i < 1<<mi->b; ++i) for (i = 0; i < 1<<mi->b; ++i)
if (mi->B[i].h) n += kh_size((idxhash_t*)mi->B[i].h); if (mi->B[i].h) n += kh_size((idxhash_t*)mi->B[i].h);
if (n == 0) return INT32_MAX;
a = (uint32_t*)malloc(n * 4); a = (uint32_t*)malloc(n * 4);
for (i = n = 0; i < 1<<mi->b; ++i) { for (i = n = 0; i < 1<<mi->b; ++i) {
idxhash_t *h = (idxhash_t*)mi->B[i].h; idxhash_t *h = (idxhash_t*)mi->B[i].h;