perf list: Avoid potential out of bounds memory read

If a desc string is 0 length then -1 will be out of bounds, add a
check.

Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: Benjamin Gray <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: Clément Le Goffic <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Dominique Martinet <[email protected]>
Cc: Dr. David Alan Gilbert <[email protected]>
Cc: Howard Chu <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jing Zhang <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Junhao He <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Oliver Upton <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Sandipan Das <[email protected]>
Cc: Sun Haiyong <[email protected]>
Cc: Tiezhu Yang <[email protected]>
Cc: Veronika Molnarova <[email protected]>
Cc: Weilin Wang <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Xu Yang <[email protected]>
Cc: Yang Jihong <[email protected]>
Cc: Yicong Yang <[email protected]>
Cc: Ze Gao <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

0 files changed, 0 insertions, 0 deletions