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quota: Fix possible GPF due to uninitialised pointers 

When dqget() in __dquot_initialize() fails e.g. due to IO error,
__dquot_initialize() will pass an array of uninitialized pointers to
dqput_all() and thus can lead to deference of random data. Fix the
problem by properly initializing the array.

CC: stable@vger.kernel.org
Signed-off-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Nikolay Borisov 2016-03-03 10:54:57 +01:00 committed by Jan Kara
parent 6332b9b5e7
commit ab73ef4639
1 changed files with 1 additions and 2 deletions
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3
fs/quota/dquot.c
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@ -1410,7 +1410,7 @@ static int dquot_active(const struct inode *inode)
static int __dquot_initialize(struct inode *inode, int type)
{
int cnt, init_needed = 0;
struct dquot **dquots, *got[MAXQUOTAS];
struct dquot **dquots, *got[MAXQUOTAS] = {};
struct super_block *sb = inode->i_sb;
qsize_t rsv;
int ret = 0;
@ -1427,7 +1427,6 @@ static int __dquot_initialize(struct inode *inode, int type)
int rc;
struct dquot *dquot;
got[cnt] = NULL;
if (type != -1 && cnt != type)
continue;
/*