@@ -1111,6 +1111,7 @@ static irqreturn_t thunderx_ocx_com_threaded_isr(int irq, void *irq_id)
unsigned long tail;
struct ocx_com_err_ctx *ctx;
+ size_t remaining;
int lane;
char *msg;
char *other;
@@ -1127,27 +1128,26 @@ static irqreturn_t thunderx_ocx_com_threaded_isr(int irq, void *irq_id)
ARRAY_SIZE(ocx->com_err_ctx));
ctx = &ocx->com_err_ctx[tail];
- snprintf(msg, OCX_MESSAGE_SIZE, "%s: OCX_COM_INT: %016llx",
- ocx->edac_dev->ctl_name, ctx->reg_com_int);
-
decode_register(other, OCX_OTHER_SIZE,
ocx_com_errors, ctx->reg_com_int);
- strncat(msg, other, OCX_MESSAGE_SIZE);
+ remaining = OCX_MESSAGE_SIZE;
+ remaining -= scnprintf(msg, remaining, "%s: OCX_COM_INT: %016llx%s",
+ ocx->edac_dev->ctl_name, ctx->reg_com_int,
+ other);
for (lane = 0; lane < OCX_RX_LANES; lane++)
if (ctx->reg_com_int & BIT(lane)) {
- snprintf(other, OCX_OTHER_SIZE,
- "\n\tOCX_LNE_INT[%02d]: %016llx OCX_LNE_STAT11[%02d]: %016llx",
- lane, ctx->reg_lane_int[lane],
- lane, ctx->reg_lane_stat11[lane]);
-
- strncat(msg, other, OCX_MESSAGE_SIZE);
-
decode_register(other, OCX_OTHER_SIZE,
ocx_lane_errors,
ctx->reg_lane_int[lane]);
- strncat(msg, other, OCX_MESSAGE_SIZE);
+
+ remaining -= scnprintf(msg + (OCX_MESSAGE_SIZE - remaining),
+ remaining,
+ "\n\tOCX_LNE_INT[%02d]: %016llx OCX_LNE_STAT11[%02d]: %016llx%s",
+ lane, ctx->reg_lane_int[lane],
+ lane, ctx->reg_lane_stat11[lane],
+ other);
}
if (ctx->reg_com_int & OCX_COM_INT_CE)
strncat() usage in thunderx_ocx_com_threaded_isr() is wrong. The size given to strncat() is the maximum number of bytes that can be written, excluding the trailing NULL. Here, the size of the 'msg' buffer is used (i.e. OCX_MESSAGE_SIZE), not the space that is remaining. The space for the ending NULL is also not taken into account. in order to fix it: - call decode_register() before the snprintf() calls - use scnprintf() instead of snprintf() and compute, in the 'remaining' variable, the space that is still available in the 'msg' buffer - add a %s at the end of the format strings and append directly the result of decode_register() stored in 'other' - write directly at the right position in the 'msg' buffer when appending some data in the for loop. Doing so, all usages of strncat() are removed. Fixes: 41003396f932 ("EDAC, thunderx: Add Cavium ThunderX EDAC driver") Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> --- This is cross-compile tested only. Review with care. --- drivers/edac/thunderx_edac.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-)