bpf: Clear pfmemalloc flag when freeing all fragments

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[ Upstream commit 8f12d1137c ]

It is possible for bpf_xdp_adjust_tail() to free all fragments. The
kfunc currently clears the XDP_FLAGS_HAS_FRAGS bit, but not
XDP_FLAGS_FRAGS_PF_MEMALLOC. So far, this has not caused a issue when
building sk_buff from xdp_buff since all readers of xdp_buff->flags
use the flag only when there are fragments. Clear the
XDP_FLAGS_FRAGS_PF_MEMALLOC bit as well to make the flags correct.

Signed-off-by: Amery Hung <ameryhung@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://patch.msgid.link/20250922233356.3356453-2-ameryhung@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Amery Hung 2025-09-22 16:33:49 -07:00 • committed by Greg Kroah-Hartman

parent db0e5ba662

commit de13a2f870

2 changed files with 6 additions and 0 deletions

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5

include/net/xdp.h

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1

net/core/filter.c

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