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Avoid calling Standard C string/array functions with NULL arguments

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glibc string.h declares memcpy() with attribute(nonnull(1,2)), causing
calls with NULL arguments to be treated as undefined behaviour.
This is consistent with ISO C99 and C11, which state that passing 0
to string functions as an array length does not remove the requirement
that the pointer to the array is a valid pointer.
gcc -fsanitize=undefined catches this while running OSTree's test suite.

Similarly, running the GLib test suite reports similar issues for
qsort(), memmove(), memcmp().

(This is a partial cherry-pick of commit e5ed410c8c0fe823883 from GLib.)

Signed-off-by: Simon McVittie <smcv@debian.org>
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=775510
Reviewed-by: Colin Walters
This commit is contained in:
Philip Withnall 2018-08-13 14:13:28 +01:00
parent 355228121e
commit 7fd9f61dbd
1 changed files with 2 additions and 1 deletions
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3
gvdb-builder.c
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@ -293,7 +293,8 @@ file_builder_add_string (FileBuilder *fb,
chunk->offset = fb->offset;
chunk->size = length;
chunk->data = g_malloc (length);
memcpy (chunk->data, string, length);
if (length != 0)
memcpy (chunk->data, string, length);
*start = guint32_to_le (fb->offset);
*size = guint16_to_le (length);