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modprobe: protect against possible SEGV 

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-01-26 08:17:45 +01:00
parent 1aaf1cb096
commit da879ec2e9
1 changed files with 8 additions and 6 deletions
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14
modutils/modprobe.c
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@ -80,12 +80,14 @@ static int read_config(const char *path);
static char *gather_options_str(char *opts, const char *append)
{
/* Speed-optimized. We call gather_options_str many times. */
if (opts == NULL) {
opts = xstrdup(append);
} else {
int optlen = strlen(opts);
opts = xrealloc(opts, optlen + strlen(append) + 2);
sprintf(opts + optlen, " %s", append);
if (append) {
if (opts == NULL) {
opts = xstrdup(append);
} else {
int optlen = strlen(opts);
opts = xrealloc(opts, optlen + strlen(append) + 2);
sprintf(opts + optlen, " %s", append);
}
}
return opts;
}