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hbitmap: add assertion on hbitmap_iter_init 

hbitmap_iter_init causes an out-of-bounds access when the "first"
argument is or greater than or equal to the size of the bitmap.
Forbid this with an assertion, and remove the failing testcase.

Reported-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-01-22 15:01:12 +01:00 committed by Kevin Wolf
parent 88ff0e48ee
commit 1b09524455
3 changed files with 6 additions and 11 deletions
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3
include/qemu/hbitmap.h
View File

@ -128,7 +128,8 @@ void hbitmap_free(HBitmap *hb);
* hbitmap_iter_init:
* @hbi: HBitmapIter to initialize.
* @hb: HBitmap to iterate on.
* @first: First bit to visit (0-based).
* @first: First bit to visit (0-based, must be strictly less than the
* size of the bitmap).
*
* Set up @hbi to iterate on the HBitmap @hb. hbitmap_iter_next will return
* the lowest-numbered bit that is set in @hb, starting at @first.

13
tests/test-hbitmap.c
View File

@ -86,7 +86,9 @@ static void hbitmap_test_init(TestHBitmapData *data,
data->bits = g_new0(unsigned long, n);
data->size = size;
data->granularity = granularity;
hbitmap_test_check(data, 0);
if (size) {
hbitmap_test_check(data, 0);
}
}
static void hbitmap_test_teardown(TestHBitmapData *data,
@ -198,14 +200,6 @@ static void test_hbitmap_iter_partial(TestHBitmapData *data,
hbitmap_test_check(data, L3 / 2);
}
static void test_hbitmap_iter_past(TestHBitmapData *data,
const void *unused)
{
hbitmap_test_init(data, L3, 0);
hbitmap_test_set(data, 0, L3);
hbitmap_test_check(data, L3);
}
static void test_hbitmap_set_all(TestHBitmapData *data,
const void *unused)
{
@ -388,7 +382,6 @@ int main(int argc, char **argv)
hbitmap_test_add("/hbitmap/size/0", test_hbitmap_zero);
hbitmap_test_add("/hbitmap/size/unaligned", test_hbitmap_unaligned);
hbitmap_test_add("/hbitmap/iter/empty", test_hbitmap_iter_empty);
hbitmap_test_add("/hbitmap/iter/past", test_hbitmap_iter_past);
hbitmap_test_add("/hbitmap/iter/partial", test_hbitmap_iter_partial);
hbitmap_test_add("/hbitmap/iter/granularity", test_hbitmap_iter_granularity);
hbitmap_test_add("/hbitmap/get/all", test_hbitmap_get_all);

1
util/hbitmap.c
View File

@ -147,6 +147,7 @@ void hbitmap_iter_init(HBitmapIter *hbi, const HBitmap *hb, uint64_t first)
hbi->hb = hb;
pos = first >> hb->granularity;
assert(pos < hb->size);
hbi->pos = pos >> BITS_PER_LEVEL;
hbi->granularity = hb->granularity;