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mtd: physmap: fix NULL pointer dereference in error path

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commit e480814f13 ("[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>
This commit is contained in:
Atsushi Nemoto 2009-03-10 12:55:55 -07:00 committed by Linus Torvalds
parent 9c1e8a4ebc
commit d58ab5cf09
1 changed files with 11 additions and 8 deletions
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19
drivers/mtd/maps/physmap.c
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@ -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