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Sync getline() with comm(1):

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- Prevent overflowing of the buffer length variable in getline() by
   limiting its maximum value.
 - Exit if reallocf(3) fails in getline(). Failure was silently
   considered as end-of-file.

Reviewed by:	ghelmer
Approved by:	trasz (mentor)
This commit is contained in:
jh 2009-12-17 17:03:47 +00:00
parent 4491896aee
commit 060a87e0f5
1 changed files with 14 additions and 9 deletions
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23
usr.bin/uniq/uniq.c
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@ -52,6 +52,7 @@ static const char rcsid[] =
#include <err.h>
#include <limits.h>
#include <locale.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -59,7 +60,8 @@ static const char rcsid[] =
#include <wchar.h>
#include <wctype.h>
#define MAXLINELEN (LINE_MAX + 1)
#define INITLINELEN (LINE_MAX + 1)
#define MAXLINELEN ((SIZE_MAX / sizeof(wchar_t)) / 2)
int cflag, dflag, uflag;
int numchars, numfields, repeats;
@ -137,8 +139,8 @@ main (int argc, char *argv[])
if (argc > 1)
ofp = file(argv[1], "w");
prevbuflen = MAXLINELEN;
thisbuflen = MAXLINELEN;
prevbuflen = INITLINELEN;
thisbuflen = INITLINELEN;
prevline = malloc(prevbuflen * sizeof(*prevline));
thisline = malloc(thisbuflen * sizeof(*thisline));
if (prevline == NULL || thisline == NULL)
@ -198,16 +200,19 @@ getline(wchar_t *buf, size_t *buflen, FILE *fp)
bufpos = 0;
while ((ch = getwc(fp)) != WEOF && ch != '\n') {
if (bufpos + 2 >= *buflen) {
if (bufpos + 1 >= *buflen) {
*buflen = *buflen * 2;
if (*buflen > MAXLINELEN)
errx(1,
"Maximum line buffer length (%zu) exceeded",
MAXLINELEN);
buf = reallocf(buf, *buflen * sizeof(*buf));
if (buf == NULL)
return (NULL);
err(1, "reallocf");
}
buf[bufpos++] = ch;
}
if (bufpos + 1 != *buflen)
buf[bufpos] = '\0';
buf[bufpos] = '\0';
return (bufpos != 0 || ch == '\n' ? buf : NULL);
}
@ -305,13 +310,13 @@ wcsicoll(wchar_t *s1, wchar_t *s2)
new_l2_buflen = wcsicoll_l2_buflen;
while (new_l1_buflen < l1) {
if (new_l1_buflen == 0)
new_l1_buflen = MAXLINELEN;
new_l1_buflen = INITLINELEN;
else
new_l1_buflen *= 2;
}
while (new_l2_buflen < l2) {
if (new_l2_buflen == 0)
new_l2_buflen = MAXLINELEN;
new_l2_buflen = INITLINELEN;
else
new_l2_buflen *= 2;
}