From 5d53bfdce008ed5c5429cdee26ad177580f252b7 Mon Sep 17 00:00:00 2001 From: Wen Yang Date: Wed, 18 Mar 2020 23:31:56 +0800 Subject: [PATCH] mtd: phram: fix a double free issue in error path commit 49c64df880570034308e4a9a49c4bc95cf8cdb33 upstream. The variable 'name' is released multiple times in the error path, which may cause double free issues. This problem is avoided by adding a goto label to release the memory uniformly. And this change also makes the code a bit more cleaner. Fixes: 4f678a58d335 ("mtd: fix memory leaks in phram_setup") Signed-off-by: Wen Yang Cc: Joern Engel Cc: Miquel Raynal Cc: Richard Weinberger Cc: Vignesh Raghavendra Cc: linux-mtd@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20200318153156.25612-1-wenyang@linux.alibaba.com Signed-off-by: Greg Kroah-Hartman --- drivers/mtd/devices/phram.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/mtd/devices/phram.c b/drivers/mtd/devices/phram.c index 931e5c2481b5..b50ec7ecd10c 100644 --- a/drivers/mtd/devices/phram.c +++ b/drivers/mtd/devices/phram.c @@ -243,22 +243,25 @@ static int phram_setup(const char *val) ret = parse_num64(&start, token[1]); if (ret) { - kfree(name); parse_err("illegal start address\n"); + goto error; } ret = parse_num64(&len, token[2]); if (ret) { - kfree(name); parse_err("illegal device length\n"); + goto error; } ret = register_device(name, start, len); - if (!ret) - pr_info("%s device: %#llx at %#llx\n", name, len, start); - else - kfree(name); + if (ret) + goto error; + pr_info("%s device: %#llx at %#llx\n", name, len, start); + return 0; + +error: + kfree(name); return ret; }