diff options
| author | Huang Shijie <shijie8@gmail.com> | 2012-08-18 13:07:41 -0400 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-10-17 03:49:13 +0100 |
| commit | c6d6eb108e31288a1a1abfef69353783dd2be611 (patch) | |
| tree | 5d9255f7a903998885ebaa16ec3cb8f7ea40258c /drivers/mtd | |
| parent | 3d6f072401a231375a960010c87945a1e70f0042 (diff) | |
mtd: mtdpart: break it as soon as we parse out the partitions
commit c51803ddba10d80d9f246066802c6e359cf1d44c upstream.
We may cause a memory leak when the @types has more then one parser.
Take the `default_mtd_part_types` for example. The default_mtd_part_types has
two parsers now: `cmdlinepart` and `ofpart`.
Assume the following case:
The kernel command line sets the partitions like:
#gpmi-nand:20m(boot),20m(kernel),1g(rootfs),-(user)
But the devicetree file(such as arch/arm/boot/dts/imx28-evk.dts) also sets
the same partitions as the kernel command line does.
In the current code, the partitions parsed out by the `ofpart` will
overwrite the @pparts which has already set by the `cmdlinepart` parser,
and the the partitions parsed out by the `cmdlinepart` is missed.
A memory leak occurs.
So we should break the code as soon as we parse out the partitions,
In actually, this patch makes a priority order between the parsers.
If one parser has already parsed out the partitions successfully,
it's no need to use another parser anymore.
Signed-off-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/mtdpart.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c index a0bd2de4752..198da0a980e 100644 --- a/drivers/mtd/mtdpart.c +++ b/drivers/mtd/mtdpart.c @@ -748,6 +748,8 @@ static const char *default_mtd_part_types[] = { * partition parsers, specified in @types. However, if @types is %NULL, then * the default list of parsers is used. The default list contains only the * "cmdlinepart" and "ofpart" parsers ATM. + * Note: If there are more then one parser in @types, the kernel only takes the + * partitions parsed out by the first parser. * * This function may return: * o a negative error code in case of failure @@ -772,11 +774,12 @@ int parse_mtd_partitions(struct mtd_info *master, const char **types, if (!parser) continue; ret = (*parser->parse_fn)(master, pparts, data); + put_partition_parser(parser); if (ret > 0) { printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n", ret, parser->name, master->name); + break; } - put_partition_parser(parser); } return ret; } |