zlib: Fix a bug when getting a gzip header extra field with inflate().
If the extra field was larger than the space the user provided with inflateGetHeader(), and if multiple calls of inflate() delivered the extra header data, then there could be a buffer overflow of the provided space. This commit assures that provided space is not exceeded. (cherry picked from zlib commit eff308af425b67093bab25f80f1ae950166bece1)
This commit is contained in:
parent
c0665d5c82
commit
dc3509f1aa
@ -763,9 +763,10 @@ 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);
|
||||
|
Loading…
Reference in New Issue
Block a user