jffs2dump: check return value of lseek

On error, lseek returns a negative value. We need to check for that
and abort, instead of passing -1 to malloc and later on to read_nocheck.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 6 insertions, 0 deletions

diff --git a/jffsX-utils/jffs2dump.c b/jffsX-utils/jffs2dump.c
index d30b59f..30455ea 100644
--- a/jffsX-utils/jffs2dump.c
+++ b/jffsX-utils/jffs2dump.c
@@ -757,6 +757,12 @@ int main(int argc, char **argv)
 
 	// get image length
 	imglen = lseek(fd, 0, SEEK_END);
+	if (imglen < 0) {
+		perror(img);
+		close(fd);
+		exit(EXIT_FAILURE);
+	}
+
 	lseek (fd, 0, SEEK_SET);
 
 	data = malloc (imglen);