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vsprintf: pre-calculate final string length for later use 

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
André Goddard Rosa 2009-12-14 18:00:56 -08:00 committed by Linus Torvalds
parent 0f4f81dce9
commit 6c35663411
1 changed files with 5 additions and 4 deletions
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9
lib/vsprintf.c
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@ -1496,13 +1496,14 @@ do { \
case FORMAT_TYPE_STR: { case FORMAT_TYPE_STR: {
const char *save_str = va_arg(args, char *); const char *save_str = va_arg(args, char *);
size_t len; size_t len;
if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
|| (unsigned long)save_str < PAGE_SIZE) || (unsigned long)save_str < PAGE_SIZE)
save_str = "(null)"; save_str = "(null)";
len = strlen(save_str); len = strlen(save_str) + 1;
if (str + len + 1 < end) if (str + len < end)
memcpy(str, save_str, len + 1); memcpy(str, save_str, len);
str += len + 1; str += len;
break; break;
} }