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zdump: catch attempts to seek past end of file in zg_seek()

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Make zg_seek() more robust.

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Reviewed-by: Philipp Rudo <prudo@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Alexander Egorenkov
2021-01-19 09:35:58 +01:00
committed by Jan Höppner
parent 0a7df9e030
commit 11e78cada5
1 changed files with 3 additions and 0 deletions
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3
zdump/zg.c
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@@ -280,6 +280,9 @@ off_t zg_seek(struct zg_fh *zg_fh, off_t off, enum zg_check check)
{
off_t rc;
if (off >= zg_fh->sb.st_size)
ERR_EXIT("Trying to seek past file end \"%s\"", zg_fh->path);
rc = lseek(zg_fh->fh, off, SEEK_SET);
if (rc == -1 && check != ZG_CHECK_NONE)
ERR_EXIT_ERRNO("Could not seek \"%s\"", zg_fh->path);