linux-kernel - [PATCH] riscv: fix memory leakage in process_accumulated

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Message-ID: <35cab46a.6d145.19334919ed0.Coremail.zhangkai@iscas.ac.cn>
Date: Sat, 16 Nov 2024 18:42:58 +0800 (GMT+08:00)
From: zhangkai@...as.ac.cn
To: Walmsley <paul.walmsley@...ive.com>, Dabbelt <palmer@...belt.com>, 
	Ou <aou@...s.berkeley.edu>, linux-riscv@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH] riscv: fix memory leakage in
 process_accumulated_relocations

When module relocation is done, process_accumulated_relocations()
frees all dynamic allocated memory. rel_head_iter-&gt;rel_entry is
missed to free that kmemleak might report:

unreferenced object 0xffffffd880c5fc40 (size 16):
  comm "insmod", pid 1101, jiffies 4295045138
  hex dump (first 16 bytes):
    e0 c0 f5 87 d8 ff ff ff 60 c5 f5 87 d8 ff ff ff  ........`.......
  backtrace (crc d2ecb20c):
    [&lt;00000000b01655f6&gt;] kmalloc_trace_noprof+0x268/0x2f6
    [&lt;000000006dc0067a&gt;] add_relocation_to_accumulate.constprop.0+0xf2/0x1aa
    [&lt;00000000e1b29a36&gt;] apply_relocate_add+0x13c/0x36e
    [&lt;000000007543f1fb&gt;] load_module+0x5c6/0x83e
    [&lt;00000000abce12e8&gt;] init_module_from_file+0x74/0xaa
    [&lt;0000000049413e3d&gt;] idempotent_init_module+0x116/0x22e
    [&lt;00000000f9b98b85&gt;] __riscv_sys_finit_module+0x62/0xae

Signed-off-by: Kai Zhang <zhangkai@...as.ac.cn>
---
 arch/riscv/kernel/module.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c
index 1cd461f3d87..f8c3c4b47dc 100644
--- a/arch/riscv/kernel/module.c
+++ b/arch/riscv/kernel/module.c
@@ -643,6 +643,7 @@ process_accumulated_relocations(struct module *me,
                        }
                        reloc_handlers[curr_type].accumulate_handler(
                                me, location, buffer);
+                       kfree(rel_head_iter-&gt;rel_entry);
                        kfree(rel_head_iter);
                }
                kfree(bucket_iter);
-- 
2.39.5

</zhangkai@...as.ac.cn>