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trace: add build-time check to avoid overrunning hex buffer

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Remove the runtime BUG_ON and change to a compile-time check in
the macro that calls the hex format routine

[Noticed by Joe Perches]
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Harvey Harrison 2008-10-08 17:44:55 -07:00 committed by Ingo Molnar
parent 2fbc474901
commit ad0a3b6811
1 changed files with 3 additions and 3 deletions
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6
kernel/trace/trace.c
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@ -335,7 +335,8 @@ trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
return len;
}
#define HEX_CHARS 17
#define MAX_MEMHEX_BYTES 8
#define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1)
static int
trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
@ -344,8 +345,6 @@ trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
unsigned char *data = mem;
int i, j;
BUG_ON(len >= HEX_CHARS);
#ifdef __BIG_ENDIAN
for (i = 0, j = 0; i < len; i++) {
#else
@ -1668,6 +1667,7 @@ do { \
#define SEQ_PUT_HEX_FIELD_RET(s, x) \
do { \
BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \
if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \
return 0; \
} while (0)