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([106.219.166.49]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7e6b7c7c86esm3737323a12.85.2024.09.26.00.49.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Sep 2024 00:49:55 -0700 (PDT) From: Riyan Dhiman To: clm@fb.com, josef@toxicpanda.com, dsterba@suse.com Cc: linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, Riyan Dhiman Subject: [PATCH] btrfs: add missing NULL check in btrfs_free_tree_block() Date: Thu, 26 Sep 2024 13:19:47 +0530 Message-ID: <20240926074947.39415-1-riyandhiman14@gmail.com> X-Mailer: git-send-email 2.46.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In commit 3ba2d3648f9dc (btrfs: reflow btrfs_free_tree_block), the block group lookup using btrfs_lookup_block_group() was added in btrfs_free_tree_= block(). However, the return value of this function is not checked for a NULL result, which can lead to null pointer dereferences if the block group is not found. This patch adds a check to ensure that if btrfs_lookup_block_group() returns NULL, the function will gracefully exit, preventing further operations that rely on a valid block group pointer. Signed-off-by: Riyan Dhiman --- Compile tested only fs/btrfs/extent-tree.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index a5966324607d..7782d4436ca0 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3454,6 +3454,8 @@ int btrfs_free_tree_block(struct btrfs_trans_handle *= trans, } =20 bg =3D btrfs_lookup_block_group(fs_info, buf->start); + if (!bg) + goto out; =20 if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { pin_down_extent(trans, bg, buf->start, buf->len, 1); --=20 2.46.1