powerpc/boot: Fix missing check of lseek() return value

[ Upstream commit 5d085ec04a000fefb5182d3b03ee46ca96d8389b ]

This is detected by Coverity scan: CID: 1440481

Signed-off-by: Bo YU <tsu.yubo@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/powerpc/boot/addnote.c b/arch/powerpc/boot/addnote.c
index 9d9f6f3..3da3e2b 100644 (file)
--- a/arch/powerpc/boot/addnote.c
+++ b/arch/powerpc/boot/addnote.c
@@ -223,7 +223,11 @@ main(int ac, char **av)
        PUT_16(E_PHNUM, np + 2);
 
        /* write back */
-       lseek(fd, (long) 0, SEEK_SET);
+       i = lseek(fd, (long) 0, SEEK_SET);
+       if (i < 0) {
+               perror("lseek");
+               exit(1);
+       }
        i = write(fd, buf, n);
        if (i < 0) {
                perror("write");