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Subject[PATCH 32/38] fs/cachefiles: remove invalid checks
Date
Unsigned values cannot be lesser than zero.

The problem has been detected using proposed semantic patch
scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1].

[1]: http://permalink.gmane.org/gmane.linux.kernel/2038576

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
---
fs/cachefiles/bind.c | 9 +++------
fs/cachefiles/daemon.c | 6 +++---
2 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/fs/cachefiles/bind.c b/fs/cachefiles/bind.c
index 6af790f..6b50c88 100644
--- a/fs/cachefiles/bind.c
+++ b/fs/cachefiles/bind.c
@@ -39,13 +39,10 @@ int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args)
args);

/* start by checking things over */
- ASSERT(cache->fstop_percent >= 0 &&
- cache->fstop_percent < cache->fcull_percent &&
- cache->fcull_percent < cache->frun_percent &&
- cache->frun_percent < 100);
+ ASSERT(cache->fstop_percent < cache->fcull_percent &&
+ cache->fcull_percent < cache->frun_percent);

- ASSERT(cache->bstop_percent >= 0 &&
- cache->bstop_percent < cache->bcull_percent &&
+ ASSERT(cache->bstop_percent < cache->bcull_percent &&
cache->bcull_percent < cache->brun_percent &&
cache->brun_percent < 100);

diff --git a/fs/cachefiles/daemon.c b/fs/cachefiles/daemon.c
index f601def..996ecd2 100644
--- a/fs/cachefiles/daemon.c
+++ b/fs/cachefiles/daemon.c
@@ -222,7 +222,7 @@ static ssize_t cachefiles_daemon_write(struct file *file,
if (test_bit(CACHEFILES_DEAD, &cache->flags))
return -EIO;

- if (datalen < 0 || datalen > PAGE_SIZE - 1)
+ if (datalen > PAGE_SIZE - 1)
return -EOPNOTSUPP;

/* drag the command string into the kernel so we can parse it */
@@ -385,7 +385,7 @@ static int cachefiles_daemon_fstop(struct cachefiles_cache *cache, char *args)
if (args[0] != '%' || args[1] != '\0')
return -EINVAL;

- if (fstop < 0 || fstop >= cache->fcull_percent)
+ if (fstop >= cache->fcull_percent)
return cachefiles_daemon_range_error(cache, args);

cache->fstop_percent = fstop;
@@ -457,7 +457,7 @@ static int cachefiles_daemon_bstop(struct cachefiles_cache *cache, char *args)
if (args[0] != '%' || args[1] != '\0')
return -EINVAL;

- if (bstop < 0 || bstop >= cache->bcull_percent)
+ if (bstop >= cache->bcull_percent)
return cachefiles_daemon_range_error(cache, args);

cache->bstop_percent = bstop;
--
1.9.1


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