diff options
Diffstat (limited to 'dev-util/re2c/files/re2c-1.3-lexer-overflow.patch')
| -rw-r--r-- | dev-util/re2c/files/re2c-1.3-lexer-overflow.patch | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/dev-util/re2c/files/re2c-1.3-lexer-overflow.patch b/dev-util/re2c/files/re2c-1.3-lexer-overflow.patch new file mode 100644 index 000000000000..4222ef430c32 --- /dev/null +++ b/dev-util/re2c/files/re2c-1.3-lexer-overflow.patch @@ -0,0 +1,40 @@ +https://bugs.gentoo.org/718350 + +From c4603ba5ce229db83a2a4fb93e6d4b4e3ec3776a Mon Sep 17 00:00:00 2001 +From: Ulya Trofimovich <skvadrik@gmail.com> +Date: Fri, 17 Apr 2020 22:47:14 +0100 +Subject: [PATCH] Fix crash in lexer refill (reported by Agostino Sarubbo). + +The crash happened in a rare case of a very long lexeme that doen't fit +into the buffer, forcing buffer reallocation. + +The crash was caused by an incorrect calculation of the shift offset +(it was smaller than necessary). As a consequence, the data from buffer +start and up to the beginning of the current lexeme was not discarded +(as it should have been), resulting in less free space for new data than +expected. +--- + src/parse/scanner.cc | 3 ++- + 1 file changed, 2 insertions(+), 1 deletion(-) + +--- a/src/parse/scanner.cc ++++ b/src/parse/scanner.cc +@@ -155,13 +155,14 @@ bool Scanner::fill(size_t need) + if (!buf) fatal("out of memory"); + + memmove(buf, tok, copy); +- shift_ptrs_and_fpos(buf - bot); ++ shift_ptrs_and_fpos(buf - tok); + delete [] bot; + bot = buf; + + free = BSIZE - copy; + } + ++ DASSERT(lim + free <= bot + BSIZE); + if (!read(free)) { + eof = lim; + memset(lim, 0, YYMAXFILL); +-- +2.26.1 + |