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win32: zlib: Fix buffer overflow on inflate (CVE-2022-37434)

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Orgad Shaneh 2024-10-02 10:13:14 +03:00 • committed by Andy Green
parent a1ee5a2c50
commit a544db3020
1 changed files with 3 additions and 2 deletions
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5
win32port/zlib/inflate.c
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@ -720,8 +720,9 @@ int flush;
if (copy > have) copy = have;
if (copy) {
if (state->head != Z_NULL &&
state->head->extra != Z_NULL) {
len = state->head->extra_len - state->length;
state->head->extra != Z_NULL &&
(len = state->head->extra_len - state->length) <
state->head->extra_max) {
zmemcpy(state->head->extra + len, next,
len + copy > state->head->extra_max ?
state->head->extra_max - len : copy);