smemstat.c | 29 25 + 4 - 0 !
1 file changed, 25 insertions(+), 4 deletions(-)

 [patch] fix null ptr dereference when uid can't be read (lp:
 #1473245)
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While stress testing a machine with a lot of low memory
pressure and processes fork/exiting very rapidly I found
that smemstat reads empty /proc/$pid/status files and hence
cannot get a process UID. This leads to no umame being
found for a new mem_info item and later on the deference
of m->uname->name segfaults on a null pointer deference
because m->uname is NULL.

Add a one-liner helper to check for the null uname and
return "<unknown>" for unknown UID uname lookups instead
of segfaulting.

Signed-off-by: Colin Ian King <colin.king@canonical.com>