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hw/9pfs: add NULL check in v9fs_path_is_ancestor()

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Add NULL check for s1->data and s2->data before using them in
string operations. This prevents potential crashes when dealing
with uninitialized paths.

This is just a defensive measure. We are currently never passing
NULL to this function.

Link: https://lore.kernel.org/qemu-devel/3348c4d683f061c23083bd45994d527be4fb7cbc.1779126034.git.qemu_oss@crudebyte.com
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
This commit is contained in:
Christian Schoenebeck
2026-05-18 19:35:36 +02:00
parent 81cc5f39aa
commit abb0cc02fb
1 changed files with 3 additions and 0 deletions
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3
hw/9pfs/9p.c
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@@ -241,6 +241,9 @@ int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
*/
static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2)
{
if (!s1->data || !s2->data) {
return 0;
}
if (!strncmp(s1->data, s2->data, s1->size - 1)) {
if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') {
return 1;