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tail -F: fix crash

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When show() detects an error and closes the file and follow() wants to
close it again, a NULL dereference occurs.

PR:	280910
MFC after:	1 week
This commit is contained in:
Andre Albsmeier 2024-08-19 10:54:24 +03:00 committed by Konstantin Belousov
parent 8132e95909
commit 308399a179
1 changed files with 2 additions and 1 deletions
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3
usr.bin/tail/forward.c
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@ -379,7 +379,8 @@ follow(file_info_t *files, enum STYLE style, off_t off)
sb2.st_dev != file->st.st_dev ||
sb2.st_nlink == 0) {
show(file);
fclose(file->fp);
if (file->fp != NULL)
fclose(file->fp);
file->fp = ftmp;
memcpy(&file->st, &sb2,
sizeof(struct stat));