io_uring/rsrc: fix rogue rsrc node grabbing

[platform/kernel/linux-starfive.git] / io_uring / filetable.c

diff --git a/io_uring/filetable.c b/io_uring/filetable.c
index 68dfc69..b80614e 100644 (file)
--- a/io_uring/filetable.c
+++ b/io_uring/filetable.c
@@ -19,6 +19,9 @@ static int io_file_bitmap_get(struct io_ring_ctx *ctx)
        unsigned long nr = ctx->file_alloc_end;
        int ret;
 
+       if (!table->bitmap)
+               return -ENFILE;
+
        do {
                ret = find_next_zero_bit(table->bitmap, nr, table->alloc_hint);
                if (ret != nr)