[PATCH v1 2/4] powerpc/powernv: opal-imc: fix debugfs name buffer size

[Xixin Liu]

char mode[16]/cmd[16] are too small for sprintf("imc_mode_%d") /
sprintf("imc_cmd_%d") when id is a full u32 (up to 20 bytes including NUL).

id comes from DT "chip-id" as u32. Enlarge the buffers and use snprintf.

Signed-off-by: Xixin Liu <liuxixin@xxxxxxxxxx>
---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/opal-imc.c b/arch/powerpc/platforms/powernv/opal-imc.c
index b3fd5c648dea..77de53d47cb6 100644
--- a/arch/powerpc/platforms/powernv/opal-imc.c
+++ b/arch/powerpc/platforms/powernv/opal-imc.c
@@ -51,7 +51,8 @@
 				    struct imc_pmu *pmu_ptr)
 {
 	static u64 loc, *imc_mode_addr, *imc_cmd_addr;
-	char mode[16], cmd[16];
+	/* "imc_mode_" / "imc_cmd_" + max u32 decimal + NUL */
+	char mode[20], cmd[20];
 	u32 cb_offset;
 	struct imc_mem_info *ptr = pmu_ptr->mem_info;
 
@@ -63,12 +64,12 @@
 	while (ptr->vbase != NULL) {
 		loc = (u64)(ptr->vbase) + cb_offset;
 		imc_mode_addr = (u64 *)(loc + IMC_CNTL_BLK_MODE_OFFSET);
-		sprintf(mode, "imc_mode_%d", (u32)(ptr->id));
+		snprintf(mode, sizeof(mode), "imc_mode_%u", ptr->id);
 		imc_debugfs_create_x64(mode, 0600, imc_debugfs_parent,
 				       imc_mode_addr);
 
 		imc_cmd_addr = (u64 *)(loc + IMC_CNTL_BLK_CMD_OFFSET);
-		sprintf(cmd, "imc_cmd_%d", (u32)(ptr->id));
+		snprintf(cmd, sizeof(cmd), "imc_cmd_%u", ptr->id);
 		imc_debugfs_create_x64(cmd, 0600, imc_debugfs_parent,
 				       imc_cmd_addr);
 		ptr++;
-- 
2.43.0