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nlist: Check whether the nl argument is not NULL

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This prevents programming errors.

Reported-by: Daniel Hodson <daniel@elttam.com.au>
Based-on-patch-by: Daniel Hodson <daniel@elttam.com.au>
Signed-off-by: Guillem Jover <guillem@hadrons.org>
This commit is contained in:
Guillem Jover 2019-06-15 14:33:32 +02:00
parent 2c754f435b
commit 3aaedb1208
2 changed files with 8 additions and 1 deletions
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5
man/nlist.3bsd
View File

@ -72,7 +72,10 @@ The last entry in the list is always
The number of invalid entries is returned if successful; otherwise, The number of invalid entries is returned if successful; otherwise,
if the file if the file
.Fa filename .Fa filename
does not exist or is not executable, the returned value is \-1. does not exist or is not executable,
or the nl pointer is
.Dv NULL ,
the returned value is \-1.
.Sh SEE ALSO .Sh SEE ALSO
.Xr elf 5 .Xr elf 5
.Sh HISTORY .Sh HISTORY

4
src/nlist.c
View File

@ -258,6 +258,10 @@ nlist(const char *name, struct nlist *list)
{ {
int fd, n; int fd, n;
if (list == NULL) {
errno = EINVAL;
return (-1);
}
fd = open(name, O_RDONLY, 0); fd = open(name, O_RDONLY, 0);
if (fd < 0) if (fd < 0)
return (-1); return (-1);