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Don't call string_copy_rev() on empty string

graph_expand() calls graph_insert_column() with the empty string as id,
which in turns leads to string_copy_rev() reading outside the allowed
memory area looking for whitespace.

To avoid this, don't call string_copy_rev() if we know the string is
empty anyway.

Signed-off-by: Romain Francoise <>

Moved the check to string_copy_rev().

Signed-off-by: Jonas Fonseca <>
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1 parent c575a60 commit cd9815d1a594d483a1efc6135e3badc996603b7f @orebokech orebokech committed with Oct 28, 2012
Showing with 3 additions and 0 deletions.
  1. +3 −0 tig.h
3 tig.h
@@ -260,6 +260,9 @@ string_copy_rev(char *dst, const char *src)
size_t srclen;
+ if (!*src)
+ return;
for (srclen = 0; srclen < SIZEOF_REV; srclen++)
if (isspace(src[srclen]))

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