Replace unsafe sprintf() calls with snprintf() in segment_save() to
prevent potential buffer overflows. The function builds command strings
by repeatedly appending to a fixed-size buffer, which could overflow if
segment ranges are numerous or values are large.

Signed-off-by: Josephine Pfeiffer <hi@josie.lol>
---
 arch/s390/mm/extmem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/s390/mm/extmem.c b/arch/s390/mm/extmem.c
index 0bc8746b6192..b6464a322eb1 100644
--- a/arch/s390/mm/extmem.c
+++ b/arch/s390/mm/extmem.c
@@ -601,6 +601,7 @@ segment_save(char *name)
 	snprintf(cmd1, sizeof(cmd1), "DEFSEG %s", name);
 	for (i=0; i<seg->segcnt; i++) {
 		size_t len = strlen(cmd1);
+
 		snprintf(cmd1 + len, sizeof(cmd1) - len, " %lX-%lX %s",
 			 seg->range[i].start >> PAGE_SHIFT,
 			 seg->range[i].end >> PAGE_SHIFT,
-- 
2.51.0