It seems to me that we still allow overflow if count == ~0. We'll then allocate 0 bytes but copy ~0 bytes. That does not sound healthy.
Fixes: f08b18266c7116e2ec6885dd53a928f580060a71
Signed-off-by: Pavel Machek <pa...@denx.de>
diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index c7ba8ac..8846fca 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -631,7 +631,7 @@ static ssize_t stm_char_write(struct file *file, const char
__user *buf,
char *kbuf;
int err;
- if (count + 1 > PAGE_SIZE)
+ if (count > PAGE_SIZE - 1)
count = PAGE_SIZE - 1;
/*
--
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