Date: Sun, 15 Jun 2014 03:54:24 +0000 (UTC) From: "Pedro F. Giffuni" <pfg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r267490 - head/usr.bin/patch Message-ID: <201406150354.s5F3sOeL077016@svn.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: pfg Date: Sun Jun 15 03:54:23 2014 New Revision: 267490 URL: http://svnweb.freebsd.org/changeset/base/267490 Log: patch: unsign the line length to avoid overflows. Patch(1) uses a short int for the line length, which is usually sufficient for regular diffs, but makes no effort to signal when there is an overflow. Change the line length to an unsigned short int to better use the fact that a length is never negative. The change is loosely inspired on a related change in DragonFly, but we avoid spending more memory than necessary. While here adjust the messages to be clearer on what is happening. MFC after: 1 week Modified: head/usr.bin/patch/patch.c head/usr.bin/patch/pch.c head/usr.bin/patch/pch.h Modified: head/usr.bin/patch/patch.c ============================================================================== --- head/usr.bin/patch/patch.c Sun Jun 15 00:53:24 2014 (r267489) +++ head/usr.bin/patch/patch.c Sun Jun 15 03:54:23 2014 (r267490) @@ -742,14 +742,18 @@ abort_context_hunk(void) static void rej_line(int ch, LINENUM i) { - size_t len; + unsigned short len; const char *line = pfetch(i); - len = strlen(line); + len = strnlen(line, USHRT_MAX); fprintf(rejfp, "%c%s", ch, line); - if (len == 0 || line[len-1] != '\n') - fprintf(rejfp, "\n\\ No newline at end of file\n"); + if (len == 0 || line[len-1] != '\n') { + if (len >= USHRT_MAX) + fprintf(rejfp, "\n\\ Line too long\n"); + else + fprintf(rejfp, "\n\\ No newline at end of line\n"); + } } static void @@ -1016,7 +1020,7 @@ patch_match(LINENUM base, LINENUM offset LINENUM pat_lines = pch_ptrn_lines() - fuzz; const char *ilineptr; const char *plineptr; - short plinelen; + unsigned short plinelen; for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { ilineptr = ifetch(iline, offset >= 0); Modified: head/usr.bin/patch/pch.c ============================================================================== --- head/usr.bin/patch/pch.c Sun Jun 15 00:53:24 2014 (r267489) +++ head/usr.bin/patch/pch.c Sun Jun 15 03:54:23 2014 (r267490) @@ -56,7 +56,7 @@ static LINENUM p_max; /* max allowed va static LINENUM p_context = 3; /* # of context lines */ static LINENUM p_input_line = 0; /* current line # from patch file */ static char **p_line = NULL;/* the text of the hunk */ -static short *p_len = NULL; /* length of each line */ +static unsigned short *p_len = NULL; /* length of each line */ static char *p_char = NULL; /* +, -, and ! */ static int hunkmax = INITHUNKMAX; /* size of above arrays to begin with */ static int p_indent; /* indent to patch */ @@ -134,7 +134,7 @@ set_hunkmax(void) if (p_line == NULL) p_line = malloc(hunkmax * sizeof(char *)); if (p_len == NULL) - p_len = malloc(hunkmax * sizeof(short)); + p_len = malloc(hunkmax * sizeof(unsigned short)); if (p_char == NULL) p_char = malloc(hunkmax * sizeof(char)); } @@ -151,7 +151,7 @@ grow_hunkmax(void) fatal("Internal memory allocation error\n"); p_line = reallocf(p_line, new_hunkmax * sizeof(char *)); - p_len = reallocf(p_len, new_hunkmax * sizeof(short)); + p_len = reallocf(p_len, new_hunkmax * sizeof(unsigned short)); p_char = reallocf(p_char, new_hunkmax * sizeof(char)); if (p_line != NULL && p_len != NULL && p_char != NULL) { @@ -1201,7 +1201,7 @@ bool pch_swap(void) { char **tp_line; /* the text of the hunk */ - short *tp_len; /* length of each line */ + unsigned short *tp_len;/* length of each line */ char *tp_char; /* +, -, and ! */ LINENUM i; LINENUM n; @@ -1358,7 +1358,7 @@ pch_context(void) /* * Return the length of a particular patch line. */ -short +unsigned short pch_line_len(LINENUM line) { return p_len[line]; Modified: head/usr.bin/patch/pch.h ============================================================================== --- head/usr.bin/patch/pch.h Sun Jun 15 00:53:24 2014 (r267489) +++ head/usr.bin/patch/pch.h Sun Jun 15 03:54:23 2014 (r267490) @@ -44,7 +44,7 @@ bool there_is_another_patch(void); bool another_hunk(void); bool pch_swap(void); char *pfetch(LINENUM); -short pch_line_len(LINENUM); +unsigned short pch_line_len(LINENUM); LINENUM pch_first(void); LINENUM pch_ptrn_lines(void); LINENUM pch_newfirst(void);
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201406150354.s5F3sOeL077016>