From: "Steven Rostedt (Red Hat)" Currently seq_buf is full when all but one byte of the buffer is filled. Change it so that the seq_buf is full when all of the buffer is filled. Some of the functions would fill the buffer completely and report everything was fine. This was inconsistent with the max of size - 1. Changing this to be max of size makes all functions consistent. Link: http://lkml.kernel.org/r/20141104160222.502133196@goodmis.org Tested-by: Jiri Kosina Acked-by: Jiri Kosina Reviewed-by: Petr Mladek Signed-off-by: Steven Rostedt --- include/linux/seq_buf.h | 6 +++--- kernel/trace/seq_buf.c | 19 +++++++++++-------- 2 files changed, 14 insertions(+), 11 deletions(-) diff --git a/include/linux/seq_buf.h b/include/linux/seq_buf.h index 5d91262433e2..581c1fc733c3 100644 --- a/include/linux/seq_buf.h +++ b/include/linux/seq_buf.h @@ -43,13 +43,13 @@ seq_buf_init(struct seq_buf *s, unsigned char *buf, unsigned int size) static inline bool seq_buf_has_overflowed(struct seq_buf *s) { - return s->len == s->size; + return s->len > s->size; } static inline void seq_buf_set_overflow(struct seq_buf *s) { - s->len = s->size; + s->len = s->size + 1; } /* @@ -61,7 +61,7 @@ seq_buf_buffer_left(struct seq_buf *s) if (seq_buf_has_overflowed(s)) return 0; - return (s->size - 1) - s->len; + return s->size - s->len; } extern __printf(2, 3) diff --git a/kernel/trace/seq_buf.c b/kernel/trace/seq_buf.c index 7dac34d1235b..9d3bb64dca31 100644 --- a/kernel/trace/seq_buf.c +++ b/kernel/trace/seq_buf.c @@ -17,7 +17,7 @@ #include /* How much buffer is written? */ -#define SEQ_BUF_USED(s) min((s)->len, (s)->size - 1) +#define SEQ_BUF_USED(s) min((s)->len, (s)->size) /** * seq_buf_print_seq - move the contents of seq_buf into a seq_file @@ -51,7 +51,7 @@ int seq_buf_vprintf(struct seq_buf *s, const char *fmt, va_list args) if (s->len < s->size) { len = vsnprintf(s->buffer + s->len, s->size - s->len, fmt, args); - if (s->len + len < s->size) { + if (s->len + len <= s->size) { s->len += len; return 0; } @@ -100,8 +100,11 @@ int seq_buf_bitmask(struct seq_buf *s, const unsigned long *maskp, WARN_ON(s->size == 0); /* - * The last byte of the buffer is used to determine if we - * overflowed or not. + * Note, because bitmap_scnprintf() only returns the number of bytes + * written and not the number that would be written, we use the last + * byte of the buffer to let us know if we overflowed. There's a small + * chance that the bitmap could have fit exactly inside the buffer, but + * it's not that critical if that does happen. */ if (len > 1) { ret = bitmap_scnprintf(s->buffer + s->len, len, maskp, nmaskbits); @@ -140,7 +143,7 @@ int seq_buf_bprintf(struct seq_buf *s, const char *fmt, const u32 *binary) if (s->len < s->size) { ret = bstr_printf(s->buffer + s->len, len, fmt, binary); - if (s->len + ret < s->size) { + if (s->len + ret <= s->size) { s->len += ret; return 0; } @@ -164,7 +167,7 @@ int seq_buf_puts(struct seq_buf *s, const char *str) WARN_ON(s->size == 0); - if (s->len + len < s->size) { + if (s->len + len <= s->size) { memcpy(s->buffer + s->len, str, len); s->len += len; return 0; @@ -186,7 +189,7 @@ int seq_buf_putc(struct seq_buf *s, unsigned char c) { WARN_ON(s->size == 0); - if (s->len + 1 < s->size) { + if (s->len + 1 <= s->size) { s->buffer[s->len++] = c; return 0; } @@ -210,7 +213,7 @@ int seq_buf_putmem(struct seq_buf *s, const void *mem, unsigned int len) { WARN_ON(s->size == 0); - if (s->len + len < s->size) { + if (s->len + len <= s->size) { memcpy(s->buffer + s->len, mem, len); s->len += len; return 0; -- 2.1.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/