diff options
| author | Atsushi Nemoto <anemo@mba.ocn.ne.jp> | 2009-03-10 12:55:55 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-03-10 15:55:11 -0700 |
| commit | d58ab5cf09679d8cb4824e22cae900c0eab5ab31 (patch) | |
| tree | 090e82a516fe8db760a1b7514ed072bb458c1e2f | |
| parent | 9c1e8a4ebcc04226cb6f3a1bf1d72f4cafd6b089 (diff) | |
| download | lwn-d58ab5cf09679d8cb4824e22cae900c0eab5ab31.tar.gz lwn-d58ab5cf09679d8cb4824e22cae900c0eab5ab31.zip | |
mtd: physmap: fix NULL pointer dereference in error path
commit e480814f138cd5d78a8efe397756ba6b6518fdb6 ("[MTD] [MAPS] physmap:
fix wrong free and del_mtd_{partition,device}") introduces a NULL pointer
dereference in physmap_flash_remove when called from the error path in
physmap_flash_probe (if map_probe failed).
Call del_mtd_{partition,device} only if info->cmtd was not NULL.
Reported-by: pHilipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/mtd/maps/physmap.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/drivers/mtd/maps/physmap.c b/drivers/mtd/maps/physmap.c index 4b122e7ab4b3..229718222db7 100644 --- a/drivers/mtd/maps/physmap.c +++ b/drivers/mtd/maps/physmap.c @@ -46,16 +46,19 @@ static int physmap_flash_remove(struct platform_device *dev) physmap_data = dev->dev.platform_data; + if (info->cmtd) { #ifdef CONFIG_MTD_PARTITIONS - if (info->nr_parts) { - del_mtd_partitions(info->cmtd); - kfree(info->parts); - } else if (physmap_data->nr_parts) - del_mtd_partitions(info->cmtd); - else - del_mtd_device(info->cmtd); + if (info->nr_parts || physmap_data->nr_parts) + del_mtd_partitions(info->cmtd); + else + del_mtd_device(info->cmtd); #else - del_mtd_device(info->cmtd); + del_mtd_device(info->cmtd); +#endif + } +#ifdef CONFIG_MTD_PARTITIONS + if (info->nr_parts) + kfree(info->parts); #endif #ifdef CONFIG_MTD_CONCAT |