From: Wen Yang <wenyang@xxxxxxxxxxxxxxxxx>
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 <wenyang@xxxxxxxxxxxxxxxxx>
Cc: Joern Engel <joern@xxxxxxxxxxxxxxx>
Cc: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Cc: Richard Weinberger <richard@xxxxxx>
Cc: Vignesh Raghavendra <vigneshr@xxxxxx>
Cc: linux-mtd@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Link: https://lore.kernel.org/linux-mtd/20200318153156.25612-1-wenyang@xxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mtd/devices/phram.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
--- a/drivers/mtd/devices/phram.c
+++ b/drivers/mtd/devices/phram.c
@@ -240,22 +240,25 @@ 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;
}
