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| author | Ian Kent <raven@themaw.net> | 2016-10-11 13:53:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-11 15:06:31 -0700 |
| commit | aa8419367b62044e92bd7993eeb83d861b59bafa (patch) | |
| tree | 9c3a1087e04854169060986344d95af52603b075 | |
| parent | b6e3795a06c2fe837e7d0319a923e8978276ec4c (diff) | |
| download | linux-stable-aa8419367b62044e92bd7993eeb83d861b59bafa.tar.gz linux-stable-aa8419367b62044e92bd7993eeb83d861b59bafa.tar.bz2 linux-stable-aa8419367b62044e92bd7993eeb83d861b59bafa.zip | |
autofs: fix dev ioctl number range check
The count of miscellaneous device ioctls in fs/autofs4/autofs_i.h is wrong.
The number of ioctls is the difference between AUTOFS_DEV_IOCTL_VERSION_CMD
and AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD (14) not the difference between
AUTOFS_IOC_COUNT and 11 (21).
[kusumi.tomohiro@gmail.com: fix typo that made the count macro negative]
Link: http://lkml.kernel.org/r/20160831033420.9910.16809.stgit@pluto.themaw.net
Link: http://lkml.kernel.org/r/20160812024841.12352.11975.stgit@pluto.themaw.net
Signed-off-by: Ian Kent <raven@themaw.net>
Cc: Tomohiro Kusumi <kusumi.tomohiro@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/autofs4/autofs_i.h | 3 | ||||
| -rw-r--r-- | fs/autofs4/dev-ioctl.c | 2 |
2 files changed, 3 insertions, 2 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h index 73e3d3810e3f..477989d255be 100644 --- a/fs/autofs4/autofs_i.h +++ b/fs/autofs4/autofs_i.h @@ -20,7 +20,8 @@ #define AUTOFS_IOC_COUNT 32 #define AUTOFS_DEV_IOCTL_IOC_FIRST (AUTOFS_DEV_IOCTL_VERSION) -#define AUTOFS_DEV_IOCTL_IOC_COUNT (AUTOFS_IOC_COUNT - 11) +#define AUTOFS_DEV_IOCTL_IOC_COUNT \ + (AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD - AUTOFS_DEV_IOCTL_VERSION_CMD) #include <linux/kernel.h> #include <linux/slab.h> diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c index d47b35a669e1..13e75177f892 100644 --- a/fs/autofs4/dev-ioctl.c +++ b/fs/autofs4/dev-ioctl.c @@ -642,7 +642,7 @@ static int _autofs_dev_ioctl(unsigned int command, cmd = _IOC_NR(command); if (_IOC_TYPE(command) != _IOC_TYPE(AUTOFS_DEV_IOCTL_IOC_FIRST) || - cmd - cmd_first >= AUTOFS_DEV_IOCTL_IOC_COUNT) { + cmd - cmd_first > AUTOFS_DEV_IOCTL_IOC_COUNT) { return -ENOTTY; } |