[PATCH V2] makedumpfile: code changes to satisfy the coverity scan

[Chao Fan]

Coverity scan found some uncheked return value when calling
function. So the return value of the function set_page_size
and lseek should be checked to satisfy the coverity scan.

In the function read_sadump_header, block_size is defined as an
unsigned long value, and it will never be less than zero, so this
comparison should be removed.

Signed-off-by: Chao Fan <cfan at redhat.com>
---
 makedumpfile.c | 3 ++-
 makedumpfile.h | 8 +++++++-
 sadump_info.c  | 3 ---
 3 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/makedumpfile.c b/makedumpfile.c
index 32f5459..53efc04 100644
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -3213,7 +3213,8 @@ initial(void)
 			MSG("because the cyclic mode doesn't support sadump format.\n");
 		}
 
-		set_page_size(sadump_page_size());
+		if (!set_page_size(sadump_page_size()))
+			return FALSE;
 
 		if (!sadump_initialize_bitmap_memory())
 			return FALSE;
diff --git a/makedumpfile.h b/makedumpfile.h
index d2fadbd..0b54228 100644
--- a/makedumpfile.h
+++ b/makedumpfile.h
@@ -42,6 +42,7 @@
 #include "dwarf_info.h"
 #include "diskdump_mod.h"
 #include "sadump_mod.h"
+#include "print_info.h"
 
 /*
  * Result of command
@@ -1745,7 +1746,12 @@ is_dumpable(struct dump_bitmap *bitmap, mdf_pfn_t pfn)
 	off_t offset;
 	if (pfn == 0 || bitmap->no_block != pfn/PFN_BUFBITMAP) {
 		offset = bitmap->offset + BUFSIZE_BITMAP*(pfn/PFN_BUFBITMAP);
-		lseek(bitmap->fd, offset, SEEK_SET);
+		if (lseek(bitmap->fd, offset, SEEK_SET) < 0 ) {
+			ERRMSG("Can't seek the bitmap(%s). %s\n",
+				bitmap->file_name, strerror(errno));
+			return FALSE;
+		}
+
 		read(bitmap->fd, bitmap->buf, BUFSIZE_BITMAP);
 		if (pfn == 0)
 			bitmap->no_block = 0;
diff --git a/sadump_info.c b/sadump_info.c
index e2c4f03..e8154f4 100644
--- a/sadump_info.c
+++ b/sadump_info.c
@@ -465,9 +465,6 @@ read_sadump_header(char *filename)
 	smh = si->smh_memory;
 
 restart:
-	if (block_size < 0)
-		return FALSE;
-
 	if (!read_device(sph, block_size, &offset))
 		return ERROR;
 
-- 
2.4.3