raw/ifpga/base: check lseek failure

In write_flash_image(), calling function "lseek" without checking
return value has risk. Negative return value should be handled as
an error condition.

Coverity issue: 367478
Fixes: a05bd1b40bde ("raw/ifpga: add FPGA RSU APIs")

Signed-off-by: Wei Huang <wei.huang@intel.com>
Acked-by: Tianfei Zhang <tianfei.zhang@intel.com>
Acked-by: Rosen Xu <rosen.xu@intel.com>

diff --git a/drivers/raw/ifpga/base/ifpga_fme_rsu.c b/drivers/raw/ifpga/base/ifpga_fme_rsu.c
index 28198ab..b5e018d 100644 (file)
--- a/drivers/raw/ifpga/base/ifpga_fme_rsu.c
+++ b/drivers/raw/ifpga/base/ifpga_fme_rsu.c
@@ -128,7 +128,12 @@ static int write_flash_image(struct ifpga_sec_mgr *smgr, const char *image,
        do {
                to_transfer = (length > IFPGA_RSU_DATA_BLK_SIZE) ?
                        IFPGA_RSU_DATA_BLK_SIZE : length;
-               lseek(fd, offset, SEEK_SET);
+               if (lseek(fd, offset, SEEK_SET) < 0) {
+                       dev_err(smgr, "Failed to seek in \'%s\' [e:%s]\n",
+                               image, strerror(errno));
+                       ret = -EIO;
+                       goto end;
+               }
                read_size = read(fd, buf, to_transfer);
                if (read_size < 0) {
                        dev_err(smgr, "Failed to read from \'%s\' [e:%s]\n",