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Fix zlib bug with a large gzip header extra field

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From zlib commit eff308af425b67093bab25f80f1ae950166bece1.
Fixes CVE-2022-37434.
This commit is contained in:
Wayne Davison
2022-08-07 09:27:57 -07:00
parent b7fdc9ef0e
commit 788f11ea6a
1 changed files with 3 additions and 2 deletions
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5
zlib/inflate.c
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@@ -739,9 +739,10 @@ int flush;
copy = state->length;
if (copy > have) copy = have;
if (copy) {
len = state->head->extra_len - state->length;
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_max) {
zmemcpy(state->head->extra + len, next,
len + copy > state->head->extra_max ?
state->head->extra_max - len : copy);