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stat: fix printing selinux context and null-dereference 

busybox stat tries to always print the selinux context, even if it
is not requested which leads to a segmentation fault due to
dereferencing a null-pointer.

This also changes the format-string used to print the context to
so it actually produces useful output.

Signed-off-by: Michael Gernoth <michael@gernoth.net>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Michael Gernoth 2014-06-27 14:08:29 +02:00 committed by Denys Vlasenko
parent 9d7cbdeee3
commit 1b487ea8a6
1 changed files with 3 additions and 2 deletions
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5
coreutils/stat.c
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@ -655,7 +655,7 @@ static bool do_stat(const char *filename, const char *format)
);
# if ENABLE_SELINUX
if (option_mask32 & OPT_SELINUX)
printf(" %lc\n", *scontext);
printf(" %s\n", scontext);
else
bb_putchar('\n');
# endif
@ -700,7 +700,8 @@ static bool do_stat(const char *filename, const char *format)
(unsigned long) statbuf.st_gid,
(gw_ent != NULL) ? gw_ent->gr_name : "UNKNOWN");
# if ENABLE_SELINUX
printf(" S_Context: %lc\n", *scontext);
if (option_mask32 & OPT_SELINUX)
printf(" S_Context: %s\n", scontext);
# endif
printf("Access: %s\n", human_time(statbuf.st_atime));
printf("Modify: %s\n", human_time(statbuf.st_mtime));