Dirk Mueller
2e45867bd7
- Add ntfs3g-unistr-use-after-free.patch: fix a use after free in ntfs_uppercase_mbs (boo#1226007). - No longer call autoconf; likely not needed anymore. OBS-URL: https://build.opensuse.org/request/show/1179761 OBS-URL: https://build.opensuse.org/package/show/filesystems/ntfs-3g_ntfsprogs?expand=0&rev=50
38 lines
1.2 KiB
Diff
38 lines
1.2 KiB
Diff
From 75dcdc2cf37478fad6c0e3427403d198b554951d Mon Sep 17 00:00:00 2001
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From: Erik Larsson <erik@tuxera.com>
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Date: Tue, 13 Jun 2023 17:47:15 +0300
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Subject: [PATCH] unistr.c: Fix use-after-free in 'ntfs_uppercase_mbs'.
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If 'utf8_to_unicode' throws an error due to an invalid UTF-8 sequence,
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then 'n' will be less than 0 and the loop will terminate without storing
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anything in '*t'. After the loop the uppercase string's allocation is
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freed, however after it is freed it is unconditionally accessed through
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'*t', which points into the freed allocation, for the purpose of NULL-
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terminating the string. This leads to a use-after-free.
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Fixed by only NULL-terminating the string when no error has been thrown.
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Thanks for Jeffrey Bencteux for reporting this issue:
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https://github.com/tuxera/ntfs-3g/issues/84
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---
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libntfs-3g/unistr.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/libntfs-3g/unistr.c b/libntfs-3g/unistr.c
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index 5854b3b7..db8ddf42 100644
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--- a/libntfs-3g/unistr.c
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+++ b/libntfs-3g/unistr.c
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@@ -1189,8 +1189,9 @@ char *ntfs_uppercase_mbs(const char *low,
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free(upp);
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upp = (char*)NULL;
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errno = EILSEQ;
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+ } else {
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+ *t = 0;
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}
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- *t = 0;
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}
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return (upp);
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}
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--
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2.45.0
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