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zdump: Fix /dev/mem reading

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This commit makes zgetdump work with /dev/mem again.
zg_seek() should not attempt to verify the given offset for devices before
issuing lseek() because special devices like /dev/mem report 0 in
stat.sb_size.

$ zgetdump -i /dev/mem
zgetdump: Trying to seek past file end "/dev/mem"

Fixes: 11e78cada5 ("zdump: catch attempts to seek past end of file in zg_seek()")
Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Alexander Egorenkov
2022-01-28 15:12:01 +01:00
committed by Jan Höppner
parent 02a0d12988
commit 455ad953a9
1 changed files with 1 additions and 1 deletions
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zdump/zg.c
+1 -1
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@@ -280,7 +280,7 @@ 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)
if (S_ISREG(zg_fh->sb.st_mode) && 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);