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fix: prevent signed integer overflow in gzseek64 for SEEK_SET #1227

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fix: prevent signed integer overflow in gzseek64 for SEEK_SET #1227

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6 changes: 4 additions & 2 deletions gzlib.c
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Original file line number Diff line number Diff line change
Expand Up @@ -385,9 +385,11 @@ z_off64_t ZEXPORT gzseek64(gzFile file, z_off64_t offset, int whence) {
return -1;

/* normalize offset to a SEEK_CUR specification */
if (whence == SEEK_SET)
if (whence == SEEK_SET) {
if (offset < 0)
return -1;
offset -= state->x.pos;
else {
} else {
offset += state->past ? 0 : state->skip;
state->skip = 0;
}
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