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| author | Al Viro <viro@zeniv.linux.org.uk> | 2020-05-19 23:48:52 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2020-05-20 00:29:36 +0200 |
| commit | 4e89b7210403fa4a8acafe7c602b6212b7af6c3b (patch) | |
| tree | 23fa6410018b40b285702244099f20977db8a5f4 | |
| parent | propagate_one(): mnt_set_mountpoint() needs mount_lock (diff) | |
| download | linux-4e89b7210403fa4a8acafe7c602b6212b7af6c3b.tar.xz linux-4e89b7210403fa4a8acafe7c602b6212b7af6c3b.zip | |
fix multiplication overflow in copy_fdtable()
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@kernel.org # v2.6.25+
Fixes: 9cfe015aa424 (get rid of NR_OPEN and introduce a sysctl_nr_open)
Reported-by: Thiago Macieira <thiago.macieira@intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | fs/file.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/file.c b/fs/file.c index c8a4e4c86e55..abb8b7081d7a 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); |