64 lines
2.2 KiB
Diff
64 lines
2.2 KiB
Diff
|
From 50cd06b484bb99bfacdd4f9d2f8ee5e52bfc7bd3 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Wu Guanghao <wuguanghao3@huawei.com>
|
||
|
|
Date: Sat, 4 Mar 2023 00:21:33 +0800
|
||
|
|
Subject: [PATCH] isuper-intel.c: fix double free in load_imsm_mpb()
|
||
|
|
|
||
|
|
In load_imsm_mpb() there is potential double free issue on super->buf.
|
||
|
|
|
||
|
|
The first location to free super->buf is from get_super_block() <==
|
||
|
|
load_and_parse_mpb() <== load_imsm_mpb():
|
||
|
|
4514 if (posix_memalign(&super->migr_rec_buf, MAX_SECTOR_SIZE,
|
||
|
|
4515 MIGR_REC_BUF_SECTORS*MAX_SECTOR_SIZE) != 0) {
|
||
|
|
4516 pr_err("could not allocate migr_rec buffer\n");
|
||
|
|
4517 free(super->buf);
|
||
|
|
4518 return 2;
|
||
|
|
4519 }
|
||
|
|
|
||
|
|
If the above error condition happens, super->buf is freed and value 2
|
||
|
|
is returned to get_super_block() eventually. Then in the following code
|
||
|
|
block inside load_imsm_mpb(),
|
||
|
|
5289 error:
|
||
|
|
5290 if (!err) {
|
||
|
|
5291 s->next = *super_list;
|
||
|
|
5292 *super_list = s;
|
||
|
|
5293 } else {
|
||
|
|
5294 if (s)
|
||
|
|
5295 free_imsm(s);
|
||
|
|
5296 close_fd(&dfd);
|
||
|
|
5297 }
|
||
|
|
at line 5295 when free_imsm() is called, super->buf is freed again from
|
||
|
|
the call chain free_imsm() <== __free_imsm(), in following code block,
|
||
|
|
4651 if (super->buf) {
|
||
|
|
4652 free(super->buf);
|
||
|
|
4653 super->buf = NULL;
|
||
|
|
4654 }
|
||
|
|
|
||
|
|
This patch sets super->buf as NULL after line 4517 in load_imsm_mpb()
|
||
|
|
to avoid the potential double free().
|
||
|
|
|
||
|
|
(Coly Li helps to re-compose the commit log)
|
||
|
|
|
||
|
|
Signed-off-by: Wu Guanghao <wuguanghao3@huawei.com>
|
||
|
|
Reviewed-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
|
||
|
|
Acked-by: Coly Li <colyli@suse.de>
|
||
|
|
Signed-off-by: Jes Sorensen <jes@trained-monkey.org>
|
||
|
|
---
|
||
|
|
super-intel.c | 1 +
|
||
|
|
1 file changed, 1 insertion(+)
|
||
|
|
|
||
|
|
diff --git a/super-intel.c b/super-intel.c
|
||
|
|
index 89fac62..4a3da84 100644
|
||
|
|
--- a/super-intel.c
|
||
|
|
+++ b/super-intel.c
|
||
|
|
@@ -4515,6 +4515,7 @@ static int load_imsm_mpb(int fd, struct intel_super *super, char *devname)
|
||
|
|
MIGR_REC_BUF_SECTORS*MAX_SECTOR_SIZE) != 0) {
|
||
|
|
pr_err("could not allocate migr_rec buffer\n");
|
||
|
|
free(super->buf);
|
||
|
|
+ super->buf = NULL;
|
||
|
|
return 2;
|
||
|
|
}
|
||
|
|
super->clean_migration_record_by_mdmon = 0;
|
||
|
|
--
|
||
|
|
2.35.3
|
||
|
|
|