[v2] proc/vmcore: fix potential memory leak in vmcore_init()

Commit Message

Jianglei Nie Sept. 14, 2022, 1:33 a.m. UTC

elfcorehdr_alloc() allocates a memory chunk for elfcorehdr_addr with
kzalloc(). If is_vmcore_usable() returns false, elfcorehdr_addr is a
predefined value. If parse_crash_elf_headers() gets some error and
returns a negetive value, the elfcorehdr_addr should be released with
elfcorehdr_free().

Fix it by calling elfcorehdr_free() when parse_crash_elf_headers() fails.

Acked-by: Baoquan He <[e-mail]>
Signed-off-by: Jianglei Nie <[e-mail]>
---
 fs/proc/vmcore.c | 1 +
 1 file changed, 1 insertion(+)

Patch

diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index f2aa86c421f2..74747571d58e 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -1567,6 +1567,7 @@  static int __init vmcore_init(void)
 		return rc;
 	rc = parse_crash_elf_headers();
 	if (rc) {
+		elfcorehdr_free(elfcorehdr_addr);
 		pr_warn("Kdump: vmcore not initialized\n");
 		return rc;
 	}