Re: [PATCH 3/5 v2] load_imsm_mpb: fix double free

When free(super->buf) but not set super->buf = NULL, will be double free.

get_super_block
	err = load_and_parse_mpb
		load_imsm_mpb(.., s, ..)
			if (posix_memalign(&super->buf, MAX_SECTOR_SIZE,
super->len) != 0) // true, super->buf != NULL if
(posix_memalign(&super->migr_rec_buf, MAX_SECTOR_SIZE,); // false
free(super->buf); //but super->buf not set NULL return 2;

	if err ! = 0
		if (s)
			free_imsm(s)
				 __free_imsm(s)
					if (s)
						free(s->buf); //double free

Signed-off-by: Wu Guanghao <redacted>
---
 super-intel.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/super-intel.c b/super-intel.c
index ba3bd41f..ee9e112e 100644
--- a/super-intel.c
+++ b/super-intel.c

@@ -4453,6 +4453,7 @@ 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;
--
2.27.0