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65 lines
2.5 KiB
Diff
65 lines
2.5 KiB
Diff
From 52a9dab6d892763b2a8334a568bd4e2c1a6fde66 Mon Sep 17 00:00:00 2001
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From: Kees Cook <keescook@chromium.org>
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Date: Sun, 13 Feb 2022 10:24:43 -0800
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Subject: [PATCH] libsubcmd: Fix use-after-free for realloc(..., 0)
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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GCC 12 correctly reports a potential use-after-free condition in the
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xrealloc helper. Fix the warning by avoiding an implicit "free(ptr)"
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when size == 0:
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In file included from help.c:12:
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In function 'xrealloc',
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inlined from 'add_cmdname' at help.c:24:2: subcmd-util.h:56:23: error: pointer may be used after 'realloc' [-Werror=use-after-free]
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56 | ret = realloc(ptr, size);
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| ^~~~~~~~~~~~~~~~~~
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subcmd-util.h:52:21: note: call to 'realloc' here
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52 | void *ret = realloc(ptr, size);
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| ^~~~~~~~~~~~~~~~~~
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subcmd-util.h:58:31: error: pointer may be used after 'realloc' [-Werror=use-after-free]
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58 | ret = realloc(ptr, 1);
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| ^~~~~~~~~~~~~~~
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subcmd-util.h:52:21: note: call to 'realloc' here
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52 | void *ret = realloc(ptr, size);
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| ^~~~~~~~~~~~~~~~~~
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Fixes: 2f4ce5ec1d447beb ("perf tools: Finalize subcmd independence")
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Reported-by: Valdis Klētnieks <valdis.kletnieks@vt.edu>
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Signed-off-by: Kees Kook <keescook@chromium.org>
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Tested-by: Valdis Klētnieks <valdis.kletnieks@vt.edu>
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Tested-by: Justin M. Forbes <jforbes@fedoraproject.org>
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Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
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Cc: linux-hardening@vger.kernel.org
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Cc: Valdis Klētnieks <valdis.kletnieks@vt.edu>
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Link: http://lore.kernel.org/lkml/20220213182443.4037039-1-keescook@chromium.org
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Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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---
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tools/lib/subcmd/subcmd-util.h | 11 ++---------
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1 file changed, 2 insertions(+), 9 deletions(-)
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diff --git a/tools/lib/subcmd/subcmd-util.h b/tools/lib/subcmd/subcmd-util.h
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index 794a375dad3601..b2aec04fce8f67 100644
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--- a/tools/lib/subcmd/subcmd-util.h
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+++ b/tools/lib/subcmd/subcmd-util.h
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@@ -50,15 +50,8 @@ static NORETURN inline void die(const char *err, ...)
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static inline void *xrealloc(void *ptr, size_t size)
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{
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void *ret = realloc(ptr, size);
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- if (!ret && !size)
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- ret = realloc(ptr, 1);
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- if (!ret) {
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- ret = realloc(ptr, size);
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- if (!ret && !size)
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- ret = realloc(ptr, 1);
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- if (!ret)
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- die("Out of memory, realloc failed");
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- }
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+ if (!ret)
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+ die("Out of memory, realloc failed");
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return ret;
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}
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