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author | Frank Asseg <frank.asseg@objecthunter.net> | 2018-03-12 21:57:06 +0300 |
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committer | Jiri Kosina <jkosina@suse.cz> | 2018-03-27 10:51:23 +0300 |
commit | 6c59f64b7ecf2bccbe73931d7d573d66ed13b537 (patch) | |
tree | 3e0be7a9e2ccb0a8372ab0c3d9c7a1faf882d9a4 /mm | |
parent | b903036aad6c46f0c94b3a58c86f7467776a5dcf (diff) | |
download | linux-6c59f64b7ecf2bccbe73931d7d573d66ed13b537.tar.xz |
tools/thermal: tmon: fix for segfault
Fixes a segfault occurring when e.g. <TAB> is pressed multiple times in the
ncurses tmon application. The segfault is caused by incrementing
cur_thermal_record in the main function without checking if it's value reached
NR_THERMAL_RECORD immediately. Since the boundary check only occurred in
update_thermal_data a race condition existed, which lead to an attempted read
beyond the last element of the trec array.
The fix was implemented by moving the cur_thermal_record incrementation to the
update_thermal_data function using a temporary variable on which the boundary
condition is checked before updating cur_thread_record, so that the variable is
never incremented beyond the trec array's boundary.
It seems the segfault does not occur on every machine: On a HP EliteBook G4 the
segfault happens, while it does not happen on a Thinkpad T540p.
Signed-off-by: Frank Asseg <frank.asseg@objecthunter.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions