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| author | Schspa Shi <schspa@gmail.com> | 2022-06-29 10:29:48 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-25 11:15:45 +0200 |
| commit | fe72beac06f59c04dfd26f78aa72788cdd770ad0 (patch) | |
| tree | 26b5646f8770dceeefa57a3358d52ff80a22ea91 | |
| parent | 59bc4c19d53bdac61ec952c01c6e864f5f0f8367 (diff) | |
| download | linux-stable-fe72beac06f59c04dfd26f78aa72788cdd770ad0.tar.gz linux-stable-fe72beac06f59c04dfd26f78aa72788cdd770ad0.tar.bz2 linux-stable-fe72beac06f59c04dfd26f78aa72788cdd770ad0.zip | |
vfio: Clear the caps->buf to NULL after free
[ Upstream commit 6641085e8d7b3f061911517f79a2a15a0a21b97b ]
On buffer resize failure, vfio_info_cap_add() will free the buffer,
report zero for the size, and return -ENOMEM. As additional
hardening, also clear the buffer pointer to prevent any chance of a
double free.
Signed-off-by: Schspa Shi <schspa@gmail.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Link: https://lore.kernel.org/r/20220629022948.55608-1-schspa@gmail.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/vfio/vfio.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 7a386fb30bf1..0d146b45e0b4 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -1808,6 +1808,7 @@ struct vfio_info_cap_header *vfio_info_cap_add(struct vfio_info_cap *caps, buf = krealloc(caps->buf, caps->size + size, GFP_KERNEL); if (!buf) { kfree(caps->buf); + caps->buf = NULL; caps->size = 0; return ERR_PTR(-ENOMEM); } |