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| author |   Alexey Khoroshilov <khoroshilov@ispras.ru> | 2014-02-10 14:25:35 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2014-02-10 16:01:40 -0800 |
| commit | a3eb7fbb41eb8d6e22d491741b8c5d5aa6cb069a (patch) | |
| tree | e82b1ed3c523ba903a104ad4e6f6f09fd76dd314 /drivers/message | |
| parent | Documentation/: update 00-INDEX files (diff) | |
| download | linux-dev-a3eb7fbb41eb8d6e22d491741b8c5d5aa6cb069a.tar.xz linux-dev-a3eb7fbb41eb8d6e22d491741b8c5d5aa6cb069a.zip | |
drivers/message/i2o/i2o_config.c: fix deadlock in compat_ioctl(I2OGETIOPS)
i2o_cfg_compat_ioctl(I2OGETIOPS) locks i2o_cfg_mutex and then calls
i2o_cfg_ioctl(I2OGETIOPS) that locks i2o_cfg_mutex as well. A deadlock
is guaranteed.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/message')
| -rw-r--r-- | drivers/message/i2o/i2o_config.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/message/i2o/i2o_config.c b/drivers/message/i2o/i2o_config.c index a60c188c2bd9..04bd3b6de401 100644 --- a/drivers/message/i2o/i2o_config.c +++ b/drivers/message/i2o/i2o_config.c @@ -754,19 +754,19 @@ static long i2o_cfg_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg) { int ret; - mutex_lock(&i2o_cfg_mutex); switch (cmd) { case I2OGETIOPS: ret = i2o_cfg_ioctl(file, cmd, arg); break; case I2OPASSTHRU32: + mutex_lock(&i2o_cfg_mutex); ret = i2o_cfg_passthru32(file, cmd, arg); + mutex_unlock(&i2o_cfg_mutex); break; default: ret = -ENOIOCTLCMD; break; } - mutex_unlock(&i2o_cfg_mutex); return ret; } |