diff options
| -rw-r--r-- | changes/ticket30743 | 7 | ||||
| -rw-r--r-- | scripts/coccinelle/debugmm.cocci | 29 |
2 files changed, 36 insertions, 0 deletions
diff --git a/changes/ticket30743 b/changes/ticket30743 new file mode 100644 index 0000000000..4f029717db --- /dev/null +++ b/changes/ticket30743 @@ -0,0 +1,7 @@ + o Minor features (maintenance scripts): + - Add a coccinelle script to detect bugs caused by incrementing or + decrementing a variable inside a call to log_debug(). Since + log_debug() is a macro whose arguments are conditionally evaluated, it + is usually an error to do this. One such bug was 30628, in which SENDME + cells were miscounted by a decrement operator inside a log_debug() + call. Closes ticket 30743. diff --git a/scripts/coccinelle/debugmm.cocci b/scripts/coccinelle/debugmm.cocci new file mode 100644 index 0000000000..dbd308df33 --- /dev/null +++ b/scripts/coccinelle/debugmm.cocci @@ -0,0 +1,29 @@ +// Look for use of expressions with side-effects inside of debug logs. +// +// This script detects expressions like ++E, --E, E++, and E-- inside of +// calls to log_debug(). +// +// The log_debug() macro exits early if debug logging is not enabled, +// potentially causing problems if its arguments have side-effects. + +@@ +expression E; +@@ +*log_debug(... , <+... --E ...+>, ... ); + + +@@ +expression E; +@@ +*log_debug(... , <+... ++E ...+>, ... ); + +@@ +expression E; +@@ +*log_debug(... , <+... E-- ...+>, ... ); + + +@@ +expression E; +@@ +*log_debug(... , <+... E++ ...+>, ... ); |