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author | Andrzej Pietrasiewicz <andrzej.p@collabora.com> | 2019-06-03 19:05:28 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-31 07:24:41 +0200 |
commit | 4b2163461e306768c0fa3418094d16b0bd6d7d16 (patch) | |
tree | 7e589902be58a096a302cc18c0d618332b7ece5b | |
parent | d9dbb3c00483afb626f8a6ba644244c6bdfcc43a (diff) | |
download | linux-stable-4b2163461e306768c0fa3418094d16b0bd6d7d16.tar.gz linux-stable-4b2163461e306768c0fa3418094d16b0bd6d7d16.tar.bz2 linux-stable-4b2163461e306768c0fa3418094d16b0bd6d7d16.zip |
usb: gadget: Zero ffs_io_data
[ Upstream commit 508595515f4bcfe36246e4a565cf280937aeaade ]
In some cases the "Allocate & copy" block in ffs_epfile_io() is not
executed. Consequently, in such a case ffs_alloc_buffer() is never called
and struct ffs_io_data is not initialized properly. This in turn leads to
problems when ffs_free_buffer() is called at the end of ffs_epfile_io().
This patch uses kzalloc() instead of kmalloc() in the aio case and memset()
in non-aio case to properly initialize struct ffs_io_data.
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
-rw-r--r-- | drivers/usb/gadget/function/f_fs.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index c7ed90084d1a..213ff03c8a9f 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -1183,11 +1183,12 @@ static ssize_t ffs_epfile_write_iter(struct kiocb *kiocb, struct iov_iter *from) ENTER(); if (!is_sync_kiocb(kiocb)) { - p = kmalloc(sizeof(io_data), GFP_KERNEL); + p = kzalloc(sizeof(io_data), GFP_KERNEL); if (unlikely(!p)) return -ENOMEM; p->aio = true; } else { + memset(p, 0, sizeof(*p)); p->aio = false; } @@ -1219,11 +1220,12 @@ static ssize_t ffs_epfile_read_iter(struct kiocb *kiocb, struct iov_iter *to) ENTER(); if (!is_sync_kiocb(kiocb)) { - p = kmalloc(sizeof(io_data), GFP_KERNEL); + p = kzalloc(sizeof(io_data), GFP_KERNEL); if (unlikely(!p)) return -ENOMEM; p->aio = true; } else { + memset(p, 0, sizeof(*p)); p->aio = false; } |