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Fix out-of-bounds write in gzungetc() #1290

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Fix out-of-bounds write in gzungetc() #1290

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2 changes: 2 additions & 0 deletions gzread.c
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Original file line number Diff line number Diff line change
Expand Up @@ -531,6 +531,8 @@ int ZEXPORT gzungetc(int c, gzFile file) {

/* if output buffer empty, put byte at end (allows more pushing) */
if (state->x.have == 0) {
if (state->out == NULL || state->size == 0)
return -1;
state->x.have = 1;
state->x.next = state->out + (state->size << 1) - 1;
state->x.next[0] = (unsigned char)c;
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