[PATCH v5 10/10] [grolbp]: Fix range check after strtol(3)

[Alejandro Colomar]

In case INT_MAX==LONG_MAX, we need to check for ERANGE to reject
high values.  The test 'n > INT_MAX' would never be true.

Fixes: d21a9dbc7a83 ("* src/devices/grolbp/lbp.cc: (long_options): Add 
-w/--linewidth option.")
Link: <https://savannah.gnu.org/bugs/?65451>
Link: <https://savannah.gnu.org/bugs/?65452>
Cc: "G. Branden Robinson" <branden@debian.org>
Cc: Dave Kemper <saint.snit@gmail.com>
Cc: "James K. Lowden" <jklowden@schemamania.org>
Cc: Colin Watson <cjwatson@debian.org>
Cc: Werner LEMBERG <wl@gnu.org>
Cc: James Clark <jjc@jclark.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
---
 src/devices/grolbp/lbp.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/devices/grolbp/lbp.cpp b/src/devices/grolbp/lbp.cpp
index c05b42ec3..c28f2e672 100644
--- a/src/devices/grolbp/lbp.cpp
+++ b/src/devices/grolbp/lbp.cpp
@@ -707,10 +707,11 @@ int main(int argc, char **argv)
     case 'w':
       {
        char *ptr;
+       errno = 0;
        long n = strtol(optarg, &ptr, 10);
        if (ptr == optarg)
          error("argument for -w must be a non-negative integer");
-       else if (n < 0 || n > INT_MAX)
+       else if (errno == ERANGE || n < 0 || n > INT_MAX)
          error("out of range argument for -w");
        else
          linewidth_factor = int(n);
-- 
2.43.0

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