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40 lines
1.1 KiB
Diff
40 lines
1.1 KiB
Diff
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From 8c7b3737d29ed5c0575bf592063de8a51450812d Mon Sep 17 00:00:00 2001
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From: Daniel Stenberg <daniel@haxx.se>
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Date: Sat, 24 Mar 2018 23:47:41 +0100
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Subject: [PATCH] http: restore buffer pointer when bad response-line is parsed
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... leaving the k->str could lead to buffer over-reads later on.
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CVE: CVE-2018-1000301
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Assisted-by: Max Dymond
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Detected by OSS-Fuzz.
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Bug: https://curl.haxx.se/docs/adv_2018-b138.html
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Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=7105
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---
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lib/http.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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--- a/lib/http.c
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+++ b/lib/http.c
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@@ -2924,6 +2924,8 @@ CURLcode Curl_http_readwrite_headers(str
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{
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CURLcode result;
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struct SingleRequest *k = &data->req;
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+ ssize_t onread = *nread;
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+ char *ostr = k->str;
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/* header line within buffer loop */
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do {
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@@ -2988,7 +2990,9 @@ CURLcode Curl_http_readwrite_headers(str
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else {
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/* this was all we read so it's all a bad header */
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k->badheader = HEADER_ALLBAD;
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- *nread = (ssize_t)rest_length;
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+ *nread = onread;
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+ k->str = ostr;
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+ return CURLE_OK;
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}
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break;
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}
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