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pack.c: check integer overflow in unpacking BER; fix #5611

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Yukihiro "Matz" Matsumoto
2021-12-23 07:56:40 +09:00
parent 42a6872c2b
commit 3b59c95ead
1 changed files with 3 additions and 0 deletions
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mrbgems/mruby-pack/src/pack.c
+3
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@@ -415,6 +415,9 @@ unpack_BER(mrb_state *mrb, const unsigned char *src, int srclen, mrb_value ary,
const unsigned char *e = p + srclen;
for (i=1; p<e; p++,i++) {
if (n > (MRB_INT_MAX>>7)) {
mrb_raise(mrb, E_RANGE_ERROR, "BER unpacking 'w' overflow");
}
n <<= 7;
n |= *p & 0x7f;
if ((*p & 0x80) == 0) break;