[PATCH v8] LoongArch: kexec_file: Fix elf_headers memory leak in retry loop

[Jinjie Ruan]

A retry allocates new elf headers and overwrites image->elf_headers,
leaking the previous buffer.

Free it before assigning.

Cc: Huacai Chen <chenhuacai@xxxxxxxxxx>
Cc: WANG Xuerui <kernel@xxxxxxxxxx>
Cc: Youling Tang <tangyouling@xxxxxxxxxx>
Cc: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
Cc: Sourabh Jain <sourabhjain@xxxxxxxxxxxxx>
Cc: Kees Cook <kees@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://sashiko.dev/#/patchset/20260729031235.2840255-1-ruanjinjie%40huawei.com
Fixes: 55d990f0084c ("LoongArch: Add EFI binary support for kexec_file")
Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
---
v7 -> v8:
- Split out from the patch set as Mike suggested.
- Link to v7: https://lore.kernel.org/all/20261026075201.699550-1-ruanjinjie@xxxxxxxxxx/
---
 arch/loongarch/kernel/machine_kexec_file.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/loongarch/kernel/machine_kexec_file.c b/arch/loongarch/kernel/machine_kexec_file.c
index 5412aa9f3568..0fe60907b97f 100644
--- a/arch/loongarch/kernel/machine_kexec_file.c
+++ b/arch/loongarch/kernel/machine_kexec_file.c
@@ -166,6 +166,10 @@ int load_other_segments(struct kimage *image,
 			vfree(headers);
 			goto out_err;
 		}
+
+		if (unlikely(image->elf_headers))
+			vfree(image->elf_headers);
+
 		image->elf_headers = headers;
 		image->elf_load_addr = kbuf.mem;
 		image->elf_headers_sz = headers_sz;
-- 
2.34.1