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dahdi-base: fix potential underflow of unsigned type #90

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dahdi-base: fix potential underflow of unsigned type #90

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7 changes: 4 additions & 3 deletions drivers/dahdi/dahdi-base.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5380,7 +5380,7 @@ static int dahdi_ioctl_get_version(unsigned long data)
{
struct dahdi_versioninfo vi;
struct ecfactory *cur;
size_t space = sizeof(vi.echo_canceller) - 1;
size_t space = sizeof(vi.echo_canceller) - 1, ec_name_len;
bool have_hwec = dahdi_any_hwec_available();

memset(&vi, 0, sizeof(vi));
Expand All @@ -5404,9 +5404,10 @@ static int dahdi_ioctl_get_version(unsigned long data)
}
strncat(vi.echo_canceller + strlen(vi.echo_canceller),
ec_name, space);
space -= strlen(ec_name);
if (space < 1)
ec_name_len = strlen(ec_name);
if (ec_name_len > space + 1)
break;
space -= ec_name_len;
if (cur->list.next && (cur->list.next != &ecfactory_list)) {
strncat(vi.echo_canceller + strlen(vi.echo_canceller),
", ", space);
Expand Down