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mtd: physmap_of: error checking to prevent a NULL pointer dereference

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This patch solves a NULL pointer dereference, this may occur if the tuple
is not mappable (jumps to continue in the for-loop). Out of the loop
possible results are:
- info->list_size == 0  if no of the tuples is mappable
- info->list_size == 1
- info->list_size > 1
If no one of the supplied tuples is mappable (info->list_size == 0) and
info->cmtd will not be set. But it is used in mtd_device_parse_register, OOPS!
actually it should generate an error in this case!

Signed-off-by: Anton Prins <anton.prins@nl.bosch.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
This commit is contained in:
Anton Prins 2012-11-27 16:38:16 +01:00 committed by Artem Bityutskiy
parent 6c810f9014
commit e58a66d84b
1 changed files with 4 additions and 2 deletions
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6
drivers/mtd/maps/physmap_of.c
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@ -285,6 +285,7 @@ static int of_flash_probe(struct platform_device *dev)
}
err = 0;
info->cmtd = NULL;
if (info->list_size == 1) {
info->cmtd = info->list[0].mtd;
} else if (info->list_size > 1) {
@ -293,9 +294,10 @@ static int of_flash_probe(struct platform_device *dev)
*/
info->cmtd = mtd_concat_create(mtd_list, info->list_size,
dev_name(&dev->dev));
if (info->cmtd == NULL)
err = -ENXIO;
}
if (info->cmtd == NULL)
err = -ENXIO;
if (err)
goto err_out;