git: a22fa5ec74e0 - main - laoder.efi: Fix error in download protcol

The branch main has been updated by imp:

URL: https://cgit.FreeBSD.org/src/commit/?id=a22fa5ec74e084c5786745e56939e78f7159007b

commit a22fa5ec74e084c5786745e56939e78f7159007b
Author:     Warner Losh <imp@FreeBSD.org>
AuthorDate: 2026-07-10 04:04:20 +0000
Commit:     Warner Losh <imp@FreeBSD.org>
CommitDate: 2026-07-10 04:09:41 +0000

    laoder.efi: Fix error in download protcol
    
    The download protocol calls download_data with FileOffset and
    BufferLength of 0 first to start the download (no data yet
    available). Calls it again with BufferLength == 0 and FileOffset the
    size of the download (again, no data). It then starts calling with
    BufferLength != 0 and FileOffset == 0 to start the download. The
    heuristic I used to detect the start was wrong, so we'd allocate the
    buffer twice. Fix that by being more explicit and not using the
    heuristic that was bogus.
    
    Fixes: afee781523e4 ("loader.efi: Recognize new memdisk=<url> and memcd=<url> options")
    Sponsored by:           Netflix
    Differential Revision:  https://reviews.freebsd.org/D58068
---
 stand/efi/loader/memdisk.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/stand/efi/loader/memdisk.c b/stand/efi/loader/memdisk.c
index 8d34d3ceae42..aa843916c799 100644
--- a/stand/efi/loader/memdisk.c
+++ b/stand/efi/loader/memdisk.c
@@ -50,11 +50,15 @@ download_data(IN VOID *Context, IN VOID *Buffer, IN UINTN BufferLength, IN UINTN
 	dl_state *ctx = Context;
 	decomp_state *dctx = ctx->dctx;
 
+	if (FileOffset == 0 && BufferLength == 0) {
+		printf("Staritng the download\n");
+		return (EFI_SUCCESS);
+	}
+
 	/*
-	 * Make a note of the size when we're hinted about it. But once
-	 * we start the download, ignore the hints.
+	 * Make a note of the size when we're hinted about it.
 	 */
-	if (ctx->size == 0 && BufferLength == 0) {
+	if (BufferLength == 0) {
 		printf("We know we will download %llu bytes\n", ULL(FileOffset));
 		ctx->size = FileOffset;
 		ctx->status = EFI_SUCCESS;