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84 lines
2.0 KiB
84 lines
2.0 KiB
1 year ago
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commit 6484ae5b8c4d4314f748e4d3c9a9baa5385e57c5
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Author: Carlos O'Donell <carlos@redhat.com>
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Date: Fri Jan 28 15:14:29 2022 -0500
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malloc: Fix -Wuse-after-free warning in tst-mallocalign1 [BZ #26779]
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The test leaks bits from the freed pointer via the return value
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in ret, and the compiler correctly identifies this issue.
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We switch the test to use TEST_VERIFY and terminate the test
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if any of the pointers return an unexpected alignment.
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This fixes another -Wuse-after-free error when compiling glibc
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with gcc 12.
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Tested on x86_64 and i686 without regression.
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Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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(cherry picked from commit 3a7bed5f5a527dbd87412551f41e42e63aeef07a)
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diff --git a/malloc/tst-mallocalign1.c b/malloc/tst-mallocalign1.c
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index 294e821afebd25ac..3e09ff30c4aa9f91 100644
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--- a/malloc/tst-mallocalign1.c
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+++ b/malloc/tst-mallocalign1.c
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@@ -20,6 +20,7 @@
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#include <stdlib.h>
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#include <inttypes.h>
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#include <malloc-size.h>
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+#include <support/check.h>
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static void *
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test (size_t s)
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@@ -31,41 +32,42 @@ test (size_t s)
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return p;
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}
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+#define ALIGNED(p) (((uintptr_t )p & MALLOC_ALIGN_MASK) == 0)
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+
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static int
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do_test (void)
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{
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void *p;
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- int ret = 0;
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p = test (2);
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- ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
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+ TEST_VERIFY (ALIGNED (p));
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free (p);
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p = test (8);
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- ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
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+ TEST_VERIFY (ALIGNED (p));
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free (p);
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p = test (13);
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- ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
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+ TEST_VERIFY (ALIGNED (p));
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free (p);
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p = test (16);
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- ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
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+ TEST_VERIFY (ALIGNED (p));
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free (p);
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p = test (23);
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- ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
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+ TEST_VERIFY (ALIGNED (p));
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free (p);
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p = test (43);
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- ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
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+ TEST_VERIFY (ALIGNED (p));
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free (p);
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p = test (123);
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- ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
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+ TEST_VERIFY (ALIGNED (p));
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free (p);
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- return ret;
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+ return 0;
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}
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#include <support/test-driver.c>
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