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Date: Tue, 26 May 2020 20:52:45 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Thiago Macieira <thiago.macieira@...el.com>, Al Viro <viro@...iv.linux.org.uk>, Sasha Levin <sashal@...nel.org>, stable@...nel.org Subject: [PATCH 4.19 10/81] fix multiplication overflow in copy_fdtable() From: Al Viro <viro@...iv.linux.org.uk> [ Upstream commit 4e89b7210403fa4a8acafe7c602b6212b7af6c3b ] cpy and set really should be size_t; we won't get an overflow on that, since sysctl_nr_open can't be set above ~(size_t)0 / sizeof(void *), so nr that would've managed to overflow size_t on that multiplication won't get anywhere near copy_fdtable() - we'll fail with EMFILE before that. Cc: stable@...nel.org # v2.6.25+ Fixes: 9cfe015aa424 (get rid of NR_OPEN and introduce a sysctl_nr_open) Reported-by: Thiago Macieira <thiago.macieira@...el.com> Signed-off-by: Al Viro <viro@...iv.linux.org.uk> Signed-off-by: Sasha Levin <sashal@...nel.org> --- fs/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/file.c b/fs/file.c index 780d29e58847..3762a3f136fd 100644 --- a/fs/file.c +++ b/fs/file.c @@ -70,7 +70,7 @@ static void copy_fd_bitmaps(struct fdtable *nfdt, struct fdtable *ofdt, */ static void copy_fdtable(struct fdtable *nfdt, struct fdtable *ofdt) { - unsigned int cpy, set; + size_t cpy, set; BUG_ON(nfdt->max_fds < ofdt->max_fds); -- 2.25.1
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