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| author | Pavel Skripkin <paskripkin@gmail.com> | 2021-12-30 17:26:49 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-08 14:23:24 +0200 |
| commit | 811b667cefbea9cb7511a874b169d6a92907137e (patch) | |
| tree | 2b9abc9623fc9d3a99652ffeb13bd217214987bf /kernel/bpf/btf.c | |
| parent | e5f642c55f4ce1021838d87ed4806c35943136d1 (diff) | |
udmabuf: validate ubuf->pagecount
[ Upstream commit 2b6dd600dd72573c23ea180b5b0b2f1813405882 ]
Syzbot has reported GPF in sg_alloc_append_table_from_pages(). The
problem was in ubuf->pages == ZERO_PTR.
ubuf->pagecount is calculated from arguments passed from user-space. If
user creates udmabuf with list.size == 0 then ubuf->pagecount will be
also equal to zero; it causes kmalloc_array() to return ZERO_PTR.
Fix it by validating ubuf->pagecount before passing it to
kmalloc_array().
Fixes: fbb0de795078 ("Add udmabuf misc device")
Reported-and-tested-by: syzbot+2c56b725ec547fa9cb29@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20211230142649.23022-1-paskripkin@gmail.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel/bpf/btf.c')
0 files changed, 0 insertions, 0 deletions