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| author | Eli Zaretskii <eliz@gnu.org> | 2014-08-27 22:40:54 +0300 |
|---|---|---|
| committer | Eli Zaretskii <eliz@gnu.org> | 2014-08-27 22:40:54 +0300 |
| commit | 9bac5fd91f5012a682be13e16561671f0f01c941 (patch) | |
| tree | 4a5508bd086ad5ee758b3d636348741d5ae154f3 /src/syntax.c | |
| parent | 110d87a1cc6a47e31ad9d70cc6366dd81d213860 (diff) | |
| download | emacs-9bac5fd91f5012a682be13e16561671f0f01c941.tar.gz | |
Fix bug #18339 with segfault when $ is typed into empty LaTeX buffer.
src/syntax.c (scan_lists): Don't examine positions before BEGV.
Diffstat (limited to 'src/syntax.c')
| -rw-r--r-- | src/syntax.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/src/syntax.c b/src/syntax.c index 4166ee211c7..df8800e90be 100644 --- a/src/syntax.c +++ b/src/syntax.c @@ -2857,10 +2857,13 @@ scan_lists (EMACS_INT from, EMACS_INT count, EMACS_INT depth, bool sexpflag) case Smath: if (!sexpflag) break; - temp_pos = dec_bytepos (from_byte); - UPDATE_SYNTAX_TABLE_BACKWARD (from - 1); - if (from != stop && c == FETCH_CHAR_AS_MULTIBYTE (temp_pos)) - DEC_BOTH (from, from_byte); + if (from > BEGV) + { + temp_pos = dec_bytepos (from_byte); + UPDATE_SYNTAX_TABLE_BACKWARD (from - 1); + if (from != stop && c == FETCH_CHAR_AS_MULTIBYTE (temp_pos)) + DEC_BOTH (from, from_byte); + } if (mathexit) { mathexit = 0; |