[PATCH mtd-utils] jffsX-utils: fix integer overflow in jffs2dump.c

[Anton Moryakov]

Report of the static analyzer:
The value of an arithmetic expression 'datsize + oobsize' is a subject to overflow because its operands are not cast to a larger data type before performing arithmetic

Corrections explained:
Fixed potential overflow in arithmetic operation datsize + oobsize  
by casting operands to unsigned long long to ensure safe computation.

Triggers found by static analyzer Svace.

Signed-off-by: Anton Moryakov <ant.v.moryakov at gmail.com>

---
 jffsX-utils/jffs2dump.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/jffsX-utils/jffs2dump.c b/jffsX-utils/jffs2dump.c
index 30455ea..5be7a5b 100644
--- a/jffsX-utils/jffs2dump.c
+++ b/jffsX-utils/jffs2dump.c
@@ -783,7 +783,7 @@ int main(int argc, char **argv)
 			read_nocheck (fd, oob, oobsize);
 			idx += datsize;
 			imglen -= oobsize;
-			len -= datsize + oobsize;
+			len -= (unsigned long long)datsize + (unsigned long long)oobsize;
 		}
 
 	} else {
-- 
2.30.2