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winicon: Fix potential integer overflow

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This commit is contained in:
bakkeby 2021-11-20 22:48:46 +01:00
parent efb9cc721e
commit c7af5c6b67
1 changed files with 2 additions and 2 deletions
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4
patch/bar_winicon.c
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@ -73,13 +73,13 @@ geticonprop(Window win)
unsigned long *i;
uint32_t bstd = UINT32_MAX, d, m;
for (i = p; i < end - 1; i += sz) {
if ((w = *i++) > UINT16_MAX || (h = *i++) > UINT16_MAX) { XFree(p); return NULL; }
if ((w = *i++) >= 16384 || (h = *i++) >= 16384) { XFree(p); return NULL; }
if ((sz = w * h) > end - i) break;
if ((m = w > h ? w : h) >= ICONSIZE && (d = m - ICONSIZE) < bstd) { bstd = d; bstp = i; }
}
if (!bstp) {
for (i = p; i < end - 1; i += sz) {
if ((w = *i++) > UINT16_MAX || (h = *i++) > UINT16_MAX) { XFree(p); return NULL; }
if ((w = *i++) >= 16384 || (h = *i++) >= 16384) { XFree(p); return NULL; }
if ((sz = w * h) > end - i) break;
if ((d = ICONSIZE - (w > h ? w : h)) < bstd) { bstd = d; bstp = i; }
}