From ddbd36103df95b3fbd199466f3203242ab9ed8f2 Mon Sep 17 00:00:00 2001 From: Dave Reisner Date: Thu, 19 Jul 2012 10:37:56 -0400 Subject: util: fix line length calc in _alpm_archive_fgets 74274b5dc347ba70 which added the real_line_size to the buffer struct didn't properly account for what happens when archive_fgets has to loop more than once to find the end of a line. In most cases, this isn't a problem, but could potentially cause a longer line such as PGP signature to be improperly read. This patch fixes the oversight and focuses on only calculating the line length when we hit the end of line marker. The effective length is then calculated via pointer arithmetic as: (start_of_last_read + read_length) - start_of_line Signed-off-by: Dave Reisner --- lib/libalpm/util.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/lib/libalpm/util.c b/lib/libalpm/util.c index c2b5d443..0196f3bb 100644 --- a/lib/libalpm/util.c +++ b/lib/libalpm/util.c @@ -1011,15 +1011,16 @@ int _alpm_archive_fgets(struct archive *a, struct archive_read_buffer *b) } if(eol) { - size_t len = b->real_line_size = (size_t)(eol - b->block_offset); + size_t len = (size_t)(eol - b->block_offset); memcpy(b->line_offset, b->block_offset, len); b->line_offset[len] = '\0'; b->block_offset = eol + 1; + b->real_line_size = b->line_offset + len - b->line; /* this is the main return point; from here you can read b->line */ return ARCHIVE_OK; } else { /* we've looked through the whole block but no newline, copy it */ - size_t len = b->real_line_size = (size_t)(b->block + b->block_size - b->block_offset); + size_t len = (size_t)(b->block + b->block_size - b->block_offset); memcpy(b->line_offset, b->block_offset, len); b->line_offset += len; b->block_offset = b->block + b->block_size; @@ -1027,6 +1028,7 @@ int _alpm_archive_fgets(struct archive *a, struct archive_read_buffer *b) * returned on next call */ if(len == 0) { b->line_offset[0] = '\0'; + b->real_line_size = b->line_offset - b->line; return ARCHIVE_OK; } } -- cgit v1.2.3-70-g09d2