[PATCH] zswap: potential NULL dereference on error in init_zswap()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



The "pool" pointer can be NULL at the end of the init_zswap().  (We
would allocate a new pool later in that situation.)  So in the error
handling then we need to make sure pool is a valid pointer before
calling "zswap_pool_destroy(pool);" because that function dereferences
the argument.

Fixes: 93d4dfa9fbd0 ("mm/zswap.c: add allocation hysteresis if pool limit is hit")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
 mm/zswap.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index 7ec8bd912d13..55094e63b72d 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -1359,7 +1359,8 @@ static int __init init_zswap(void)
 	return 0;
 
 fallback_fail:
-	zswap_pool_destroy(pool);
+	if (pool)
+		zswap_pool_destroy(pool);
 hp_fail:
 	cpuhp_remove_state(CPUHP_MM_ZSWP_MEM_PREPARE);
 dstmem_fail:
-- 
2.11.0




[Index of Archives]     [Kernel Development]     [Kernel Announce]     [Kernel Newbies]     [Linux Networking Development]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Device Mapper]

  Powered by Linux