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firmware_loader: builtin: ignore 0-size firmware

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Currently, the builtin firmware loader allows 0-size firmware to be
returned successfully to drivers. This differs from all other loading
mechanisms (filesystem, sysfs fallback) which reject 0-byte files, and
forces drivers to add boilerplate size checks.

Modify firmware_request_builtin() to reject 0-size firmware. This will
also result in firmware loader falling back to other mechanisms if an
empty built-in firmware is present.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Link: https://patch.msgid.link/20260426043041.649202-1-dmitry.torokhov@gmail.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
Dmitry Torokhov 2026-04-25 21:30:38 -07:00 committed by Danilo Krummrich
parent 584afc86a1
commit d059966c0c
1 changed files with 2 additions and 0 deletions
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2
drivers/base/firmware_loader/builtin/main.c
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@ -53,6 +53,8 @@ bool firmware_request_builtin(struct firmware *fw, const char *name)
for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++) {
if (strcmp(name, b_fw->name) == 0) {
if (b_fw->size == 0)
return false;
fw->size = b_fw->size;
fw->data = b_fw->data;
return true;