ceph: fix length validation in parse_reply_info()
"len" is read from network and thus needs validation. Otherwise, given a bogus "len" value, p+len could be an out-of-bounds pointer, which is used in further parsing. Signed-off-by: Xi Wang <xi.wang@gmail.com> Signed-off-by: Sage Weil <sage@newdream.net>
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@ -262,6 +262,7 @@ static int parse_reply_info(struct ceph_msg *msg,
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/* trace */
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ceph_decode_32_safe(&p, end, len, bad);
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if (len > 0) {
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ceph_decode_need(&p, end, len, bad);
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err = parse_reply_info_trace(&p, p+len, info, features);
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if (err < 0)
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goto out_bad;
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@ -270,6 +271,7 @@ static int parse_reply_info(struct ceph_msg *msg,
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/* extra */
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ceph_decode_32_safe(&p, end, len, bad);
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if (len > 0) {
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ceph_decode_need(&p, end, len, bad);
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err = parse_reply_info_extra(&p, p+len, info, features);
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if (err < 0)
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goto out_bad;
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