From: Song Liu
Sent: 30 October 2020 23:55
Making perf with gcc-9.1.1 generates the following warning:
CC ui/browsers/hists.o ui/browsers/hists.c: In function 'perf_evsel__hists_browse': ui/browsers/hists.c:3078:61: error: '%d' directive output may be \ truncated writing between 1 and 11 bytes into a region of size \ between 2 and 12 [-Werror=format-truncation=]
3078 | "Max event group index to sort is %d (index from 0 to %d)", | ^~ ui/browsers/hists.c:3078:7: note: directive argument in the range [-2147483648, 8] 3078 | "Max event group index to sort is %d (index from 0 to %d)", | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from /usr/include/stdio.h:937, from ui/browsers/hists.c:5:
IOW, the string in line 3078 might be too long for buf[] of 64 bytes.
Fix this by increasing the size of buf[] to 128.
ISTM that something should be unsigned so that the bound check that puts an upper bound of 8 implies a lower bound.
David
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