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([2405:201:682f:389d:df22:56ae:c631:2dc]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82ca85fc72asm11685664b3a.48.2026.03.31.18.28.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Mar 2026 18:28:18 -0700 (PDT) From: Deepanshu Kartikey To: jgg@ziepe.ca, leon@kernel.org Cc: kees@kernel.org, eaujames@ddn.com, parav@nvidia.com, maorg@nvidia.com, rosenp@gmail.com, jiri@resnulli.us, linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, Deepanshu Kartikey , syzbot+4334f9a250019c1b79b4@syzkaller.appspotmail.com Subject: [PATCH] RDMA/cache: fix invalid-free of flex-array data_vec in release_gid_table Date: Wed, 1 Apr 2026 06:58:10 +0530 Message-ID: <20260401012810.11876-1-kartikey406@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Commit 74e2711bb2af ("RDMA/core: Use kzalloc_flex for GID table") converted alloc_gid_table() to use kzalloc_flex(), which allocates the ib_gid_table struct and its trailing data_vec flex array member in a single contiguous slab block. However, release_gid_table() was not updated accordingly and still calls kfree(table->data_vec), passing a pointer that points 216 bytes into the middle of the slab object rather than its head. This is an invalid free which KASAN catches as: BUG: KASAN: invalid-free in release_gid_table+0x384/0x470 Since data_vec is now a flex array member of ib_gid_table, it is freed implicitly when kfree(table) is called. Remove the redundant and invalid kfree(table->data_vec). Fixes: 74e2711bb2af ("RDMA/core: Use kzalloc_flex for GID table") Reported-by: syzbot+4334f9a250019c1b79b4@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=4334f9a250019c1b79b4 Tested-by: syzbot+4334f9a250019c1b79b4@syzkaller.appspotmail.com Signed-off-by: Deepanshu Kartikey --- drivers/infiniband/core/cache.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c index 896486fa6185..647a547e2d7f 100644 --- a/drivers/infiniband/core/cache.c +++ b/drivers/infiniband/core/cache.c @@ -801,7 +801,6 @@ static void release_gid_table(struct ib_device *device, } mutex_destroy(&table->lock); - kfree(table->data_vec); kfree(table); } -- 2.43.0