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buf_ref: make sure the reference buffer does not exceed the parent size (#15288)

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This commit is contained in:
Riccardo Schirone 2019-10-17 02:39:31 +02:00 committed by radare
parent 2d143a8316
commit b7aa0c5792
1 changed files with 5 additions and 3 deletions
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8
libr/util/buf_ref.c
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@ -29,10 +29,11 @@ static bool buf_ref_init(RBuffer *b, const void *user) {
// NOTE: we only support readonly ref-buffers for now. Supporting
// read-write would mean to choose how we want to handle writing to the
// referencer. Copy-on-write? Write to the buffer underneath?
ut64 parent_sz = r_buf_size (u->parent);
b->readonly = true;
priv->parent = r_buf_ref (u->parent);
priv->base = u->offset;
priv->size = u->size;
priv->base = R_MIN (u->offset, parent_sz);
priv->size = R_MIN (parent_sz - priv->base, u->size);
b->priv = priv;
return true;
}
@ -46,7 +47,8 @@ static bool buf_ref_fini(RBuffer *b) {
static bool buf_ref_resize(RBuffer *b, ut64 newsize) {
struct buf_ref_priv *priv = get_priv_ref (b);
priv->size = newsize;
ut64 parent_sz = r_buf_size (priv->parent);
priv->size = R_MIN (parent_sz - priv->base, newsize);
return true;
}