The 'Coverity Scan' found a problem in new write_once() function:
272 size_t bytes;
273 bytes = do_pwrite(file->fd, offset, count, count, pwritev2_flags);
>>> CID 1420710: Control flow issues (NO_EFFECT)
>>> This less-than-zero comparison of an unsigned value is never true. "bytes < 0UL".
274 if (bytes < 0)
275 return -1;
That's unreasonable. do_pwrite return 'ssize_t' type value, which can
be less than zero, but we use a 'size_t' to get the return value. So
change the size_t to ssize_t for it can store the return value
correctly.
By the chance, correct all 'ssize_t' type problems in pwrite related
functions.
Signed-off-by: Zorro Lang <zlang@xxxxxxxxxx>
---
V2 changed more than V1, as below:
1) The return value type of do_pwritev and do_pwrite, from 'int' to 'ssize_t'
2) The arguments type of do_pwritev and do_pwrite, from 'ssize_t' to 'size_t'
Thanks,
Zorro
io/pwrite.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/io/pwrite.c b/io/pwrite.c
index 26f79579..3df976a8 100644
--- a/io/pwrite.c
+++ b/io/pwrite.c
@@ -61,12 +61,12 @@ pwrite_help(void)
}
#ifdef HAVE_PWRITEV
-static int
+static ssize_t
do_pwritev(
int fd,
off64_t offset,
- ssize_t count,
- ssize_t buffer_size,
+ size_t count,
+ size_t buffer_size,
int pwritev2_flags)
{
int vecs = 0;
@@ -105,12 +105,12 @@ do_pwritev(
#define do_pwritev(fd, offset, count, buffer_size) (0)
#endif
-static int
+static ssize_t
do_pwrite(
int fd,
off64_t offset,
- ssize_t count,
- ssize_t buffer_size,
+ size_t count,
+ size_t buffer_size,
int pwritev2_flags)
{
if (!vectors)
@@ -269,7 +269,7 @@ write_once(
long long *total,
int pwritev2_flags)
{
- size_t bytes;
+ ssize_t bytes;
bytes = do_pwrite(file->fd, offset, count, count, pwritev2_flags);
if (bytes < 0)
return -1;
--
2.13.6
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