cpt

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commit 4d1dfb082e27e8a66be7d758c2021b68f05079ba
parent dd584890e131648f74496768b7ee7e431ca988f6
Author: Cem Keylan <cem@ckyln.com>
Date:   Wed,  3 Jun 2020 22:24:46 +0300

kiss-stat: fix segfault

This fixes an issue when the file doesn't have a registered owner in
the passwd database, but we still tried to print it. We now check if
the entry exists before we try printing it.

Diffstat:
Mbin/kiss-stat.c | 11++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/bin/kiss-stat.c b/bin/kiss-stat.c @@ -14,19 +14,24 @@ int main (int argc, char *argv[]) { struct stat sb; - // Exit if no or multiple arguments are given + // Exit if no or multiple arguments are given. if (argc != 2 || strcmp(argv[1], "--help") == 0) { fprintf(stderr, "Usage: %s <pathname>\n", argv[0]); return(1); } - // Exit if file stat cannot be obtained + // Exit if file stat cannot be obtained. if (lstat(argv[1], &sb) == -1) { perror(argv[0]); return(1); } - // Print the user name of file owner + // Exit if name of the owner cannot be retrieved. + if (!getpwuid(sb.st_uid)) { + return(1); + } + + // Print the user name of file owner. struct passwd *pw = getpwuid(sb.st_uid); printf("%s\n", pw->pw_name); return(0);