linux-kernel - [PATCH] riscv: Fix memory leak in module_frob_arch

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Message-Id: <20251026091912.39727-1-linmq006@gmail.com>
Date: Sun, 26 Oct 2025 17:19:08 +0800
From: Miaoqian Lin <linmq006@...il.com>
To: Paul Walmsley <pjw@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>,
	Samuel Holland <samuel.holland@...ive.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org
Cc: linmq006@...il.com,
	stable@...r.kernel.org
Subject: [PATCH] riscv: Fix memory leak in module_frob_arch_sections()

The current code directly overwrites the scratch pointer with the
return value of kvrealloc(). If kvrealloc() fails and returns NULL,
the original buffer becomes unreachable, causing a memory leak.

Fix this by using a temporary variable to store kvrealloc()'s return
value and only update the scratch pointer on success.

Found via static anlaysis and this is similar to commit 42378a9ca553
("bpf, verifier: Fix memory leak in array reallocation for stack state")

Fixes: be17c0df6795 ("riscv: module: Optimize PLT/GOT entry counting")
Cc: stable@...r.kernel.org
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 arch/riscv/kernel/module-sections.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/kernel/module-sections.c b/arch/riscv/kernel/module-sections.c
index 75551ac6504c..1675cbad8619 100644
--- a/arch/riscv/kernel/module-sections.c
+++ b/arch/riscv/kernel/module-sections.c
@@ -119,6 +119,7 @@ int module_frob_arch_sections(Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
 	unsigned int num_plts = 0;
 	unsigned int num_gots = 0;
 	Elf_Rela *scratch = NULL;
+	Elf_Rela *new_scratch;
 	size_t scratch_size = 0;
 	int i;
 
@@ -168,9 +169,12 @@ int module_frob_arch_sections(Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
 		scratch_size_needed = (num_scratch_relas + num_relas) * sizeof(*scratch);
 		if (scratch_size_needed > scratch_size) {
 			scratch_size = scratch_size_needed;
-			scratch = kvrealloc(scratch, scratch_size, GFP_KERNEL);
-			if (!scratch)
+			new_scratch = kvrealloc(scratch, scratch_size, GFP_KERNEL);
+			if (!new_scratch) {
+				kvfree(scratch);
 				return -ENOMEM;
+			}
+			scratch = new_scratch;
 		}
 
 		for (size_t j = 0; j < num_relas; j++)
-- 
2.39.5 (Apple Git-154)