diff options
| author | Ricardo Branco <rbranco@suse.de> | 2024-01-03 20:32:47 +0000 |
|---|---|---|
| committer | Xin LI <delphij@FreeBSD.org> | 2024-01-04 09:00:23 +0000 |
| commit | 1fb3caee72241b9b4dacbfb0109c972a86d4401f (patch) | |
| tree | 19350fde9365f08de9a88e062cfabf524e44d4d5 | |
| parent | e23954bd42fe4331b67ba8f6446bcccf751096f1 (diff) | |
tail: Do not trust st_size if it equals zero.
PR: bin/276107
MFC after: 1 week
| -rw-r--r-- | usr.bin/tail/forward.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/usr.bin/tail/forward.c b/usr.bin/tail/forward.c index 010a36b4c793..a5303385a74f 100644 --- a/usr.bin/tail/forward.c +++ b/usr.bin/tail/forward.c @@ -102,7 +102,7 @@ forward(FILE *fp, const char *fn, enum STYLE style, off_t off, struct stat *sbp) case FBYTES: if (off == 0) break; - if (S_ISREG(sbp->st_mode)) { + if (S_ISREG(sbp->st_mode) && sbp->st_size > 0) { if (sbp->st_size < off) off = sbp->st_size; if (fseeko(fp, off, SEEK_SET) == -1) { @@ -134,7 +134,7 @@ forward(FILE *fp, const char *fn, enum STYLE style, off_t off, struct stat *sbp) } break; case RBYTES: - if (S_ISREG(sbp->st_mode)) { + if (S_ISREG(sbp->st_mode) && sbp->st_size > 0) { if (sbp->st_size >= off && fseeko(fp, -off, SEEK_END) == -1) { ierr(fn); @@ -151,7 +151,7 @@ forward(FILE *fp, const char *fn, enum STYLE style, off_t off, struct stat *sbp) return; break; case RLINES: - if (S_ISREG(sbp->st_mode)) + if (S_ISREG(sbp->st_mode) && sbp->st_size > 0) if (!off) { if (fseeko(fp, (off_t)0, SEEK_END) == -1) { ierr(fn); |