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qcow2: Prevent backing file names longer than 1023

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We reject backing file names with a length of more than 1023 characters
when opening a qcow2 file, so we should not produce such files
ourselves.

Cc: qemu-stable@nongnu.org
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2016-04-06 18:32:48 +02:00 committed by Kevin Wolf
parent 40a99aace3
commit 4e876bcf2b
1 changed files with 4 additions and 0 deletions
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4
block/qcow2.c
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@ -1986,6 +1986,10 @@ static int qcow2_change_backing_file(BlockDriverState *bs,
{
BDRVQcow2State *s = bs->opaque;
if (backing_file && strlen(backing_file) > 1023) {
return -EINVAL;
}
pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: "");
pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: "");