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From c976fd2e72678a171693d2b6333c2c499ef4d588 Mon Sep 17 00:00:00 2001
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From: Lukas Czerner <lczerner@redhat.com>
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Date: Fri, 6 Aug 2021 11:58:20 +0200
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Subject: [PATCH 44/46] libsupport: fix potental NULL pointer dereferences in
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quota functions
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Content-Type: text/plain
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get_dq() function can fail when the memory allocation fails and so we
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could end up dereferencing NULL pointer. Fix it.
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Signed-off-by: Lukas Czerner <lczerner@redhat.com>
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Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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---
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lib/support/mkquota.c | 8 ++++++--
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lib/support/quotaio_tree.c | 2 +-
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2 files changed, 7 insertions(+), 3 deletions(-)
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diff --git a/lib/support/mkquota.c b/lib/support/mkquota.c
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index ef50c9ab..280b1046 100644
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--- a/lib/support/mkquota.c
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+++ b/lib/support/mkquota.c
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@@ -432,7 +432,8 @@ void quota_data_sub(quota_ctx_t qctx, struct ext2_inode_large *inode,
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dict = qctx->quota_dict[qtype];
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if (dict) {
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dq = get_dq(dict, get_qid(inode, qtype));
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- dq->dq_dqb.dqb_curspace -= space;
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+ if (dq)
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+ dq->dq_dqb.dqb_curspace -= space;
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}
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}
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}
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@@ -459,7 +460,8 @@ void quota_data_inodes(quota_ctx_t qctx, struct ext2_inode_large *inode,
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dict = qctx->quota_dict[qtype];
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if (dict) {
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dq = get_dq(dict, get_qid(inode, qtype));
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- dq->dq_dqb.dqb_curinodes += adjust;
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+ if (dq)
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+ dq->dq_dqb.dqb_curinodes += adjust;
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}
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}
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}
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@@ -532,6 +534,8 @@ static int scan_dquots_callback(struct dquot *dquot, void *cb_data)
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struct dquot *dq;
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dq = get_dq(quota_dict, dquot->dq_id);
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+ if (!dq)
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+ return -1;
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dq->dq_id = dquot->dq_id;
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dq->dq_flags |= DQF_SEEN;
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diff --git a/lib/support/quotaio_tree.c b/lib/support/quotaio_tree.c
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index 6cc4fb5b..5910e637 100644
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--- a/lib/support/quotaio_tree.c
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+++ b/lib/support/quotaio_tree.c
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@@ -601,7 +601,7 @@ static int report_tree(struct dquot *dquot, unsigned int blk, int depth,
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__le32 *ref = (__le32 *) buf;
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if (!buf)
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- return 0;
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+ return -1;
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read_blk(dquot->dq_h, blk, buf);
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if (depth == QT_TREEDEPTH - 1) {
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--
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2.35.1
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