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From 13ba5b619a153f240320eb92b59158d657bdeb3a Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Sun, 28 Jun 2020 13:16:46 +0200
Subject: [PATCH] Reset HTML parser input before reporting encoding error
If charset conversion fails, reset the input pointers before reporting
the error and bailing out. Otherwise, the input pointers are left in an
invalid state which could lead to use-after-free and other memory
errors.
Similar to f9e7997e. Found by OSS-Fuzz.
---
HTMLparser.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/HTMLparser.c b/HTMLparser.c
index 9ade6635..7fba9429 100644
--- a/HTMLparser.c
+++ b/HTMLparser.c
@@ -6160,12 +6160,12 @@ htmlParseChunk(htmlParserCtxtPtr ctxt, const char *chunk, int size,
size_t current = ctxt->input->cur - ctxt->input->base;
nbchars = xmlCharEncInput(in, terminate);
+ xmlBufSetInputBaseCur(in->buffer, ctxt->input, base, current);
if (nbchars < 0) {
htmlParseErr(ctxt, XML_ERR_INVALID_ENCODING,
"encoder error\n", NULL, NULL);
return(XML_ERR_INVALID_ENCODING);
}
- xmlBufSetInputBaseCur(in->buffer, ctxt->input, base, current);
}
}
}
--
2.27.0
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