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mtd: Fix possible refcounting issue when going through partition nodes

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Under normal conditions, the loop goes over all child partitions, and
'breaks' when the relevant partition is found. In this case we get a
reference to the partition node without ever releasing it. Indeed, right
after the mtd_check_of_node() function returns, we call of_node_get()
again over this very same node. It is probably safer to keep the
counters even in this helper and call of_node_put() before break-ing.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Julia Lawall <julia.lawall@inria.fr>
Closes: https://lore.kernel.org/r/202312250546.ISzglvM2-lkp@intel.com/
Cc: Christian Marangi <ansuelsmth@gmail.com>
Cc: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20240104081446.126540-1-miquel.raynal@bootlin.com
This commit is contained in:
Miquel Raynal 2024-01-04 09:14:46 +01:00
parent 59950610c0
commit 5ab9bbf6c6
1 changed files with 1 additions and 0 deletions
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drivers/mtd/mtdcore.c
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@ -621,6 +621,7 @@ static void mtd_check_of_node(struct mtd_info *mtd)
if (plen == mtd_name_len &&
!strncmp(mtd->name, pname + offset, plen)) {
mtd_set_of_node(mtd, mtd_dn);
of_node_put(mtd_dn);
break;
}
}