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top: Prevent out-of-bounds writes in PUFF(). __Tweaked

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This commit moves some overhead to the Batch mode path
where it's needed. And given the new 'else if' test we
can delete some now redundant logic in the other path.

Reference(s):
. original qualys patch
0117-top-Prevent-out-of-bounds-writes-in-PUFF.patch
commit 059ae8b512

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner 2018-05-18 00:00:00 -05:00 committed by Craig Small
parent d34c6eb5b4
commit 129b7e2b44
1 changed files with 3 additions and 4 deletions
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7
top/top.h
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@ -546,14 +546,13 @@ typedef struct WIN_t {
. assumed to represent a complete screen ROW
. subject to optimization, thus MAY be discarded */
#define PUFF(fmt,arg...) do { \
char _str[ROWMAXSIZ], *_eol; \
char _str[ROWMAXSIZ]; \
const int _len = snprintf(_str, sizeof(_str), fmt, ## arg); \
_eol = _str + (_len < 0 ? 0 : (size_t)_len >= sizeof(_str) ? sizeof(_str)-1 : (size_t)_len); \
if (Batch) { \
char *_eol = _str + (_len < 0 ? 0 : (size_t)_len >= sizeof(_str) ? sizeof(_str)-1 : (size_t)_len); \
while (_eol > _str && _eol[-1] == ' ') _eol--; *_eol = '\0'; putp(_str); } \
else if (Pseudo_row >= 0 && Pseudo_row < Screen_rows) { \
char *_ptr = &Pseudo_screen[Pseudo_row * ROWMAXSIZ]; \
if (Pseudo_row + 1 < Screen_rows) ++Pseudo_row; \
char *_ptr = &Pseudo_screen[Pseudo_row++ * ROWMAXSIZ]; \
if (!strcmp(_ptr, _str)) putp("\n"); \
else { \
strcpy(_ptr, _str); \