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[ Upstream commit53270fb0fd] Syzbot reported a memory leak about skb: unreferenced object 0xffff88810e144e00 (size 240): comm "syz-executor284", pid 3701, jiffies 4294952403 (age 12.620s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff83ab79a9>] __alloc_skb+0x1f9/0x270 net/core/skbuff.c:497 [<ffffffff82a5cf64>] alloc_skb include/linux/skbuff.h:1267 [inline] [<ffffffff82a5cf64>] virtual_ncidev_write+0x24/0xe0 drivers/nfc/virtual_ncidev.c:116 [<ffffffff815f6503>] do_loop_readv_writev fs/read_write.c:759 [inline] [<ffffffff815f6503>] do_loop_readv_writev fs/read_write.c:743 [inline] [<ffffffff815f6503>] do_iter_write+0x253/0x300 fs/read_write.c:863 [<ffffffff815f66ed>] vfs_writev+0xdd/0x240 fs/read_write.c:934 [<ffffffff815f68f6>] do_writev+0xa6/0x1c0 fs/read_write.c:977 [<ffffffff848802d5>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff848802d5>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84a00087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd In nci_rx_data_packet(), if we don't get a valid conn_info, we will return directly but forget to release the skb. Reported-by: syzbot+cdb9a427d1bc08815104@syzkaller.appspotmail.com Fixes:4aeee6871e("NFC: nci: Add dynamic logical connections support") Signed-off-by: Liu Shixin <liushixin2@huawei.com> Link: https://lore.kernel.org/r/20221118082419.239475-1-liushixin2@huawei.com Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.