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-rw-r--r--archival/gunzip.c4
-rw-r--r--gunzip.c4
2 files changed, 4 insertions, 4 deletions
diff --git a/archival/gunzip.c b/archival/gunzip.c
index c3960e9..65f4356 100644
--- a/archival/gunzip.c
+++ b/archival/gunzip.c
@@ -158,9 +158,9 @@ extern int gunzip_main(int argc, char **argv)
delete_old_file = TRUE;
extension = strrchr(if_name, '.');
- if (strcmp(extension, ".gz") == 0) {
+ if (extension && strcmp(extension, ".gz") == 0) {
length -= 3;
- } else if (strcmp(extension, ".tgz") == 0) {
+ } else if (extension && strcmp(extension, ".tgz") == 0) {
length -= 4;
} else {
error_msg_and_die("Invalid extension");
diff --git a/gunzip.c b/gunzip.c
index c3960e9..65f4356 100644
--- a/gunzip.c
+++ b/gunzip.c
@@ -158,9 +158,9 @@ extern int gunzip_main(int argc, char **argv)
delete_old_file = TRUE;
extension = strrchr(if_name, '.');
- if (strcmp(extension, ".gz") == 0) {
+ if (extension && strcmp(extension, ".gz") == 0) {
length -= 3;
- } else if (strcmp(extension, ".tgz") == 0) {
+ } else if (extension && strcmp(extension, ".tgz") == 0) {
length -= 4;
} else {
error_msg_and_die("Invalid extension");