416baaa9-dc9f-4396-8d5f-8c081fb06d67NVD:CVE-2024-26878CVE-2024-26878
In the Linux kernel, the following vulnerability has been resolved:
quota: Fix potential NULL pointer dereference
Below race may cause NULL pointer dereference
P1 P2
dquot_free_inode quota_off
drop_dquot_ref
remove_dquot_ref
dquots = i_dquot(inode)
dquots = i_dquot(inode)
srcu_read_lock
dquots[cnt]) != NULL (1)
dquots[type] = NULL (2)
spin_lock(&dquots[cnt]->dq_dqb_lock) (3)
…
If dquot_free_inode(or other routines) checks inode’s quota pointers (1)
before quota_off sets it to NULL(2) and use it (3) after that, NULL pointer
dereference will be triggered.
So let’s fix it by using a temporary pointer to avoid this issue.
References
git.kernel.org/stable/c/1ca72a3de915f87232c9a4cb9bebbd3af8ed3e25
git.kernel.org/stable/c/40a673b4b07efd6f74ff3ab60f38b26aa91ee5d5
git.kernel.org/stable/c/49669f8e7eb053f91d239df7b1bfb4500255a9d0
git.kernel.org/stable/c/61380537aa6dd32d8a723d98b8f1bd1b11d8fee0
git.kernel.org/stable/c/6afc9f4434fa8063aa768c2bf5bf98583aee0877
git.kernel.org/stable/c/7f9e833fc0f9b47be503af012eb5903086939754
git.kernel.org/stable/c/8514899c1a4edf802f03c408db901063aa3f05a1
git.kernel.org/stable/c/d0aa72604fbd80c8aabb46eda00535ed35570f1f
git.kernel.org/stable/c/f2649d98aa9ca8623149b3cb8df00c944f5655c7
lists.debian.org/debian-lts-announce/2024/06/msg00017.html
lists.debian.org/debian-lts-announce/2024/06/msg00020.html
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