52 lines
1.5 KiB
Diff
52 lines
1.5 KiB
Diff
From 2355eac59e91e1465696150cf0efc9029ba4f9b2 Mon Sep 17 00:00:00 2001
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From: Nick Wellnhofer <wellnhofer@aevum.de>
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Date: Sun, 22 Jan 2023 14:52:06 +0100
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Subject: [PATCH] malloc-fail: Fix null deref if growing input buffer fails
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Also add some error checks.
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Found with libFuzzer, see #344.
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Reference:https://github.com/GNOME/libxml2/commit/2355eac59e91e1465696150cf0efc9029ba4f9b2
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Conflict:xmlIO.c
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---
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encoding.c | 3 ++-
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parserInternals.c | 6 ++++++
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2 files changed, 8 insertions(+), 1 deletion(-)
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diff --git a/encoding.c b/encoding.c
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index 8ce407f..c073a9c 100644
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--- a/encoding.c
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+++ b/encoding.c
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@@ -2288,7 +2288,8 @@ xmlCharEncInput(xmlParserInputBufferPtr input, int flush)
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toconv = 64 * 1024;
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written = xmlBufAvail(out);
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if (toconv * 2 >= written) {
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- xmlBufGrow(out, toconv * 2);
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+ if (xmlBufGrow(out, toconv * 2) < 0)
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+ return (-1);
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written = xmlBufAvail(out);
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}
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if ((written > 128 * 1024) && (flush == 0))
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diff --git a/parserInternals.c b/parserInternals.c
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index cee4cd9..dd1dc9c 100644
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--- a/parserInternals.c
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+++ b/parserInternals.c
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@@ -326,6 +326,12 @@ xmlParserInputGrow(xmlParserInputPtr in, int len) {
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ret = xmlParserInputBufferGrow(in->buf, len);
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in->base = xmlBufContent(in->buf->buffer);
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+ if (in->base == NULL) {
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+ in->base = BAD_CAST "";
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+ in->cur = in->base;
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+ in->end = in->base;
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+ return(-1);
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+ }
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in->cur = in->base + indx;
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in->end = xmlBufEnd(in->buf->buffer);
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--
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2.27.0
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